I am about to sell my near new Cordoba setup and install the same Viper brakes. I tool the easy way, got hold of some 74 A body drum brake spindles and bought the complete adapter kit from Doctor Diff. I did not get his rotors because they were going to cost as much to drop ship to Canada as the price of the rotors themselves, but anyway, I need 73 c body !New Yorker rotors or aftermarket equivalent. My setup came at a reasonable price as I received the spindles for nothing from a friend and I got my Viper Calipers for $250. DDiff kit was $246 (not sure of exact) and rotors will run $200 or so. There are ways to do the same if you have more time than money and access to a milling machinery I took the easier path. As Moparman said - Brad might chime in and he made his adapters to do the same setup.