72 Duster Rear End and Brakes

I have a 68 B-body 8 3/4 rear axle in mine and we just put a 65 B-body 8 3/4 in my friend's 71 Demon this summer. Just need to move the spring pads. You get the large 5x4.5 bolt circle with factory parts.

For the disk brake kit, DoctorDiff has two sizes.
http://www.doctordiff.com/rear-disc-brake-kit-10.7-rotor.html
http://www.doctordiff.com/rear-disc-brake-kit-11.7-rotor.html

Great kit because it has well designed calipers, not the crappy GM eldorado ones from the 70s. Also you can keep the stock wheel bearings.