Problems Identifying and Matching up new Brake Calipers

To those that don't know-the 76 A body caliper used little larger pistons than the 73-75 A body. I think they were the same as the F and later M body calipers. Probably doesn't really matter but probably does?:lol:
That's info I didn't know.....and yeah, it would matter if you're rebuilding calipers and get the wrong pistons or seals. lol