The 72 is a one year only fender only because of the mounting tabs for the steel panel that attaches above the headlight buckets. If they are cut off, the fenders work for 73-76 cars too.
They kinda don't tho. There's a bolt on the front where the fender bolts to the firewall that is relocated on '73 and up. Not a real big deal but a dead giveaway that it's not the right fender.
'72 really is one-of-a-kind. Aside from that and the aforementioned tab is the difference in side marker lights. And the reason why AMD won't trouble themselves to repop them again. Too obscure and the '70-71 fender fits.