Rick, wrecking yard, items `73 to `87 GMC or Chevy caliphers, brackets, rotors, master, booster and prop valve only if needed, if your keeping the stock six lug bolt pattern, you can get new rotors from auto zone or Orielys cheaper, now there are two versions of the rotors with matching caliphers, one inch and the heavy duty one inch and a quarter, ensure you get the latter especially if your getting the parts from differant trucks, use the `73 to `87 ball joints and everything will bolt up, note all disc brakes `69 to `72 were one inch rotors for sure..in fact the is a guy parting out several trucks in Alta not to far from you, and welcome to the site......
http://www.earlyclassic.com/catalog.aspx
ECE sells spindles for $249