List of Disc Brake Donor Cars

http://www.bigblockdart.com/techpages/spindles.shtml

Very good 73-up A-body versus 73-up B,F,J,M,R-body spindle comparison w/pictures.

I've got 80-83 cordoba spindles/brakes on my 73 duster. I'm happy enough.

Looking forward to trying the jeep disc to 8-1/4 axle swap.
http://www.bigblockdart.com/forum/showthread.php?3157-8-1-4-Disc-Brake-Swap

http://www.jeepforum.com/forum/f11/zj-rear-disc-conversion-8-25-write-up-whole-truth-607435/