Well, if you do have Original"C" body parts, they are BUDD disc brakes, from any 65-68 "C" body car.
You just can't go to the parts stores and order up those "C" body disc brake parts.
But there are one or two ebay vendors that sell stuff, but you had better not be shocked at the $$$$$$$ your gonna, hafta, be spending.

If your lucky maybe you have 69-73, single piston disc brake parts.
Post a couple of pictures of what you have, and then lots of people could determine what you have.