Upper control arm question

69GT said
My question is, did the 73 upper A-arms still use the bolts with the offset washers? I thought I read somewhere that Chrysler changed them starting in 72 or 73

You might be thinking about the small ball joint vs big ball joint that happened at about that time.

So a 73 and newer will not fit in a 72 and older car, but a 72 and older will fit on a 73 and newer with small to large taper adapter.