Thanks Dutch, that's what I thought because the top one is so full of bondo that it must have been the original one on the car eons ago. None of my other 3 (shaped like the bottom pic) are aftermarket, they're used ones that came off of cars. When I went to AMD's and Roseville's websites all I saw was the bottom shaped type being reproduced too. A long time ago I think I read or heard that after 1970 they were re-shaped, something to do with the leaf springs. Man, I gotta start writing things down.
Anyway, looks like we can add another part to that "unique for '70 only" list.