F,M,J Body Brakes fit on an A-Body?

I had heard about the Dr. Diff adapters and now with your help know what they look like. I guess my big concern now is the lower ball joint. I've heard that I have to use the 73-76 lower ball joint. Not sure what the difference is. I wonder if the ball joint itself is larger like the top or the holes for the bolts are larger? All of my front end suspension is new with very little miles on them as my car made its first on the road trip around Sept of last year and now its apart again for some other stuff.