Hard to tell, but looks like it might be part 32879 on carfiche:
http://www.carfiche.com/s13/?3:h:14(click on the diagram to enlarge it)
Sometimes the best way to deal with the parts counter person is to point to something in a diagram.
HOWEVER... I don't see how this would affect reverse. ? ? ?Are you sure you installed the stick correctly - not backwards - so the bend faces the right way?
EDIT: I just saw your previous post about having problems in 5th also. This happened to other people when they put the stick in backwards.