Take a look under a '00 or newer GM 3/4 or 1 ton truck (HD models). They have rear disks, and the 6.0 powered trucks have the 14 bolt rear end. The Deisels and 8.1 trucks use a Dana 80, but the brake parts should be usable on the 14 bolt as well. Strip the axle for the hubs, brackets, calipers, and parking brake parts. Should be a virtual bolt on, and uses easily available parts. I would advise using the rotors and calipers for mockup only, use the calipers for cores and get new ones. As far as the rotors go, GM has had alot of problems with their rotors, the aftermarket ones are better.