Lost part of my rally center cap

someone told me those are 72 only center caps ....that is not confirmed but I have a few of those. If they are one year only I can see why because that is ridiculous

Nope, 75 and later, the center pops/snaps in place.....think it had somethin to due with how the fullsize spare tire/rally's wheel mounted in the trunk so you wouldn't have to remove the whole center cap.