Interchange question

My buddy has a 68 or 69 Dart. I built him a really nice and aggressive transmission and helped a little building his motor but the rear end is an issue. It's a Ford 8.8 we believe and he wants to get an 8 3/4 housing. I suspect the flange to flange distance is the same in both previous and later model years but I don't actually know the interchange range for that car.

Maybe you guys could help me out with what the correct one would be for that car and what other years will interchange.

Another Mopar buddy down in Knoxville knows a guy that's a lot of A body rear housings, pigs and complete rear axles but before I have him inquire about buying one I want to do my homework.

Thanks in advance,

Wayne