Toyota Tundra

2006-11 → 2021-10 · chassis GSK5#,UCK5#,UPK5#,USK5# · catalogue 841430 · United States

Supported model Data version 2023-05

Parts groups Model variants Characteristics Frame ranges Catalogue groups Illustration notes Newest parts Spec codes

Ring, Snap (FOR REAR PROPELLER SHAFT JOINT SPIDER BEARING)

PNC 37401E · 205 part lines in this catalogue

Drawn on 370612, 370613B, 370615, 370616B, 370827 — open a drawing to see this group in context.

Part number	Fitment	Period	Status	List price
90521-A0003 note	UCK56,57,USK56,57	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0003 note	UCK55,USK55	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0004 note	UCK55,USK55	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0004 note	UCK56,57,USK56,57	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0005 note	UCK55,USK55	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0005 note	UCK56,57,USK56,57	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0006 note	UCK55,USK55	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0006 note	UCK56,57,USK56,57	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0007 note	UCK55,USK55	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0007 note	GSK50,UCK50,USK50	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0007 note	UCK56,57,USK56,57	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0007 note	GSK51,UCK51,52,USK51,52	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0008 note	GSK51,UCK51,52,USK51,52	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0008 note	UCK56,57,USK56,57	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0008 note	GSK50,UCK50,USK50	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0008 note	UCK55,USK55	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0009 note	UCK55,USK55	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0009 note	GSK50,UCK50,USK50	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0009 note	UCK56,57,USK56,57	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0009 note	GSK51,UCK51,52,USK51,52	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0010 note	UCK55,USK55	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0010 note	GSK50,UCK50,USK50	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0010 note	UCK56,57,USK56,57	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0010 note	GSK51,UCK51,52,USK51,52	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0011 note	UCK55,USK55	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0011 note	GSK50,UCK50,USK50	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0011 note	UCK56,57,USK56,57	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0011 note	GSK51,UCK51,52,USK51,52	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0012 note	GSK51,UCK51,52,USK51,52	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0012 note	UCK56,57,USK56,57	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0012 note	GSK50,UCK50,USK50	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0012 note	UCK55,USK55	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0013 note	GSK50,UCK50,USK50	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0013 note	UCK56,57,USK56,57	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0013 note	GSK51,UCK51,52,USK51,52	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0013 note	UCK55,USK55	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0014 note	UCK55,USK55	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0014 note	GSK50,UCK50,USK50	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0014 note	UCK56,57,USK56,57	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0014 note	GSK51,UCK51,52,USK51,52	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0015 note	GSK50,UCK50,USK50	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0015 note	GSK51,UCK51,52,USK51,52	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0015 note	UCK56,57,USK56,57	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0015 note	UCK55,USK55	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0016 note	UCK55,USK55	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0016 note	GSK50,UCK50,USK50	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0016 note	UCK56,57,USK56,57	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0016 note	GSK51,UCK51,52,USK51,52	2006-11 → 2009-04	Superseded / ended 2009-04	—
90521-A0003 note	USK56;UPK56,USK57 S S TYPE	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0003 note	USK55	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0003 note	UPK57;UPK56 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0003 note	UPK55	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0004 note	UPK55	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0004 note	UPK57;UPK56 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0004 note	USK56;UPK56,USK57 S S TYPE	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0004 note	USK55	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0005 note	UPK55	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0005 note	UPK57;UPK56 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0005 note	USK56;UPK56,USK57 S S TYPE	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0005 note	USK55	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0006 note	USK56;UPK56,USK57 S S TYPE	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0006 note	USK55	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0006 note	UPK55	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0006 note	UPK57;UPK56 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0007 note	UPK57;UPK56 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0007 note	UPK51 S;GSK51,USK51,52	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0007 note	USK56;UPK56,USK57 S S TYPE	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0007 note	GSK50,UPK50	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0007 note	USK55	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0007 note	UPK55	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0007 note	USK50	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0007 note	UPK52;UPK51 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0008 note	USK50	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0008 note	UPK55	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0008 note	UPK52;UPK51 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0008 note	USK55	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0008 note	UPK57;UPK56 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0008 note	GSK50,UPK50	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0008 note	USK56;UPK56,USK57 S S TYPE	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0008 note	UPK51 S;GSK51,USK51,52	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0009 note	USK56;UPK56,USK57 S S TYPE	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0009 note	UPK57;UPK56 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0009 note	UPK52;UPK51 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0009 note	USK50	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0009 note	UPK55	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0009 note	UPK51 S;GSK51,USK51,52	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0009 note	USK55	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0009 note	GSK50,UPK50	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0010 note	GSK50,UPK50	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0010 note	USK56;UPK56,USK57 S S TYPE	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0010 note	UPK51 S;GSK51,USK51,52	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0010 note	USK55	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0010 note	UPK52;UPK51 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0010 note	UPK57;UPK56 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0010 note	USK50	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0010 note	UPK55	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0011 note	UPK51 S;GSK51,USK51,52	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0011 note	USK56;UPK56,USK57 S S TYPE	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0011 note	GSK50,UPK50	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0011 note	USK55	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0011 note	UPK55	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0011 note	USK50	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0011 note	UPK57;UPK56 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0011 note	UPK52;UPK51 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0012 note	GSK50,UPK50	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0012 note	USK56;UPK56,USK57 S S TYPE	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0012 note	UPK51 S;GSK51,USK51,52	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0012 note	UPK55	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0012 note	USK50	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0012 note	UPK57;UPK56 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0012 note	UPK52;UPK51 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0012 note	USK55	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0013 note	UPK57;UPK56 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0013 note	UPK55	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0013 note	USK50	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0013 note	UPK52;UPK51 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0013 note	UPK51 S;GSK51,USK51,52	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0013 note	USK56;UPK56,USK57 S S TYPE	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0013 note	GSK50,UPK50	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0013 note	USK55	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0014 note	UPK51 S;GSK51,USK51,52	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0014 note	USK56;UPK56,USK57 S S TYPE	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0014 note	USK55	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0014 note	GSK50,UPK50	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0014 note	UPK52;UPK51 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0014 note	UPK57;UPK56 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0014 note	USK50	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0014 note	UPK55	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0015 note	UPK51 S;GSK51,USK51,52	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0015 note	USK56;UPK56,USK57 S S TYPE	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0015 note	UPK52;UPK51 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0015 note	UPK57;UPK56 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0015 note	USK50	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0015 note	UPK55	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0015 note	USK55	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0015 note	GSK50,UPK50	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0016 note	GSK50,UPK50	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0016 note	UPK57;UPK56 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0016 note	USK56;UPK56,USK57 S S TYPE	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0016 note	UPK51 S;GSK51,USK51,52	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0016 note	UPK52;UPK51 D,L CUT DAM TO LENGTH AS SPECIFI…	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0016 note	UPK55	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0016 note	USK50	2009-04 → 2010-05	Superseded / ended 2010-05	—
90521-A0016 note	USK55	2009-04 → 2013-08	Superseded / ended 2013-08	—
90521-A0003 note	UPK56,USK56,57	2013-08 → 2017-04	Superseded / ended 2017-04	—
90521-A0004 note	UPK56,USK56,57	2013-08 → 2017-04	Superseded / ended 2017-04	—
90521-A0005 note	UPK56,USK56,57	2013-08 → 2017-04	Superseded / ended 2017-04	—
90521-A0006 note	UPK56,USK56,57	2013-08 → 2017-04	Superseded / ended 2017-04	—
90521-A0007 note	GSK51	2013-08 → 2014-09	Superseded / ended 2014-09	—
90521-A0007 note	UPK56,USK56,57	2013-08 → 2017-04	Superseded / ended 2017-04	—
90521-A0007 note	UPK51,USK51,52	2013-08 → 2017-08	Superseded / ended 2017-08	—
90521-A0008 note	UPK56,USK56,57	2013-08 → 2017-04	Superseded / ended 2017-04	—
90521-A0008 note	UPK56,USK56,57	2017-04 → 2017-08	Superseded / ended 2017-08	—
90521-A0008 note	UPK51,USK51,52	2013-08 → 2017-08	Superseded / ended 2017-08	—
90521-A0008 note	GSK51	2013-08 → 2014-09	Superseded / ended 2014-09	—
90521-A0009 note	UPK56,USK56,57	2013-08 → 2017-04	Superseded / ended 2017-04	—
90521-A0009 note	UPK51,USK51,52	2013-08 → 2017-08	Superseded / ended 2017-08	—
90521-A0009 note	GSK51	2013-08 → 2014-09	Superseded / ended 2014-09	—
90521-A0010 note	UPK56,USK56,57	2013-08 → 2017-04	Superseded / ended 2017-04	—
90521-A0010 note	UPK51,USK51,52	2013-08 → 2017-08	Superseded / ended 2017-08	—
90521-A0010 note	UPK56,USK56,57	2017-04 → 2017-08	Superseded / ended 2017-08	—
90521-A0010 note	GSK51	2013-08 → 2014-09	Superseded / ended 2014-09	—
90521-A0011 note	UPK56,USK56,57	2017-04 → 2017-08	Superseded / ended 2017-08	—
90521-A0011 note	UPK56,USK56,57	2013-08 → 2017-04	Superseded / ended 2017-04	—
90521-A0011 note	UPK51,USK51,52	2013-08 → 2017-08	Superseded / ended 2017-08	—
90521-A0011 note	GSK51	2013-08 → 2014-09	Superseded / ended 2014-09	—
90521-A0012 note	UPK56,USK56,57	2013-08 → 2017-04	Superseded / ended 2017-04	—
90521-A0012 note	UPK51,USK51,52	2013-08 → 2017-08	Superseded / ended 2017-08	—
90521-A0012 note	GSK51	2013-08 → 2014-09	Superseded / ended 2014-09	—
90521-A0013 note	UPK56,USK56,57	2017-04 → 2017-08	Superseded / ended 2017-08	—
90521-A0013 note	UPK51,USK51,52	2013-08 → 2017-08	Superseded / ended 2017-08	—
90521-A0013 note	UPK56,USK56,57	2013-08 → 2017-04	Superseded / ended 2017-04	—
90521-A0013 note	GSK51	2013-08 → 2014-09	Superseded / ended 2014-09	—
90521-A0014 note	UPK56,USK56,57	2013-08 → 2017-04	Superseded / ended 2017-04	—
90521-A0014 note	UPK51,USK51,52	2013-08 → 2017-08	Superseded / ended 2017-08	—
90521-A0014 note	UPK56,USK56,57	2017-04 → 2017-08	Superseded / ended 2017-08	—
90521-A0014 note	GSK51	2013-08 → 2014-09	Superseded / ended 2014-09	—
90521-A0015 note	UPK56,USK56,57	2013-08 → 2017-04	Superseded / ended 2017-04	—
90521-A0015 note	UPK56,USK56,57	2017-04 → 2017-08	Superseded / ended 2017-08	—
90521-A0015 note	GSK51	2013-08 → 2014-09	Superseded / ended 2014-09	—
90521-A0015 note	UPK51,USK51,52	2013-08 → 2017-08	Superseded / ended 2017-08	—
90521-A0016 note	GSK51	2013-08 → 2014-09	Superseded / ended 2014-09	—
90521-A0016 note	UPK51,USK51,52	2013-08 → 2017-08	Superseded / ended 2017-08	—
90521-A0016 note	UPK56,USK56,57	2017-04 → 2017-08	Superseded / ended 2017-08	—
90521-A0016 note	UPK56,USK56,57	2013-08 → 2017-04	Superseded / ended 2017-04	—
90521-A0007 note	UPK51	2017-08 → 2019-07	Superseded / ended 2019-07	—
90521-A0007 note	USK51,52	2017-08 → —	Current	—
90521-A0008 note	UPK5#;USK56,57 HTWCF HIGH EFFICIENCY TWIN CAM(FLEX	2017-08 → 2019-07	Superseded / ended 2019-07	—
90521-A0008 note	USK5# HTWC HIGH EFFICIENCY TWIN CAM	2017-08 → —	Current	—
90521-A0009 note	UPK51	2017-08 → 2019-07	Superseded / ended 2019-07	—
90521-A0009 note	USK51,52	2017-08 → —	Current	—
90521-A0010 note	UPK5#;USK56,57 HTWCF HIGH EFFICIENCY TWIN CAM(FLEX	2017-08 → 2019-07	Superseded / ended 2019-07	—
90521-A0010 note	USK5# HTWC HIGH EFFICIENCY TWIN CAM	2017-08 → —	Current	—
90521-A0011 note	UPK5#;USK56,57 HTWCF HIGH EFFICIENCY TWIN CAM(FLEX	2017-08 → 2019-07	Superseded / ended 2019-07	—
90521-A0011 note	USK5# HTWC HIGH EFFICIENCY TWIN CAM	2017-08 → —	Current	—
90521-A0012 note	UPK51	2017-08 → 2019-07	Superseded / ended 2019-07	—
90521-A0012 note	USK51,52	2017-08 → —	Current	—
90521-A0013 note	UPK5#;USK56,57 HTWCF HIGH EFFICIENCY TWIN CAM(FLEX	2017-08 → 2019-07	Superseded / ended 2019-07	—
90521-A0013 note	USK5# HTWC HIGH EFFICIENCY TWIN CAM	2017-08 → —	Current	—
90521-A0014 note	UPK5#;USK56,57 HTWCF HIGH EFFICIENCY TWIN CAM(FLEX	2017-08 → 2019-07	Superseded / ended 2019-07	—
90521-A0014 note	USK5# HTWC HIGH EFFICIENCY TWIN CAM	2017-08 → —	Current	—
90521-A0015 note	UPK5#;USK56,57 HTWCF HIGH EFFICIENCY TWIN CAM(FLEX	2017-08 → 2019-07	Superseded / ended 2019-07	—
90521-A0015 note	USK5# HTWC HIGH EFFICIENCY TWIN CAM	2017-08 → —	Current	—
90521-A0016 note	UPK5#;USK56,57 HTWCF HIGH EFFICIENCY TWIN CAM(FLEX	2017-08 → 2019-07	Superseded / ended 2019-07	—
90521-A0016 note	USK5# HTWC HIGH EFFICIENCY TWIN CAM	2017-08 → —	Current	—

Several lines under one group is normal — they are the variants for different build periods, destinations and specifications. The fitment codes are what separate them.