I bought this car with the motor and tranny missing as well as other assorted parts, I am stuck on the rear break set up. It has Alcon's on the front and Varga Single piston on the rear with a brake conversion of some kind. I can fit the caliper over the rotor but is doesn't quite sit low enough to get all the pad on the rotor as well as the Ebrake won''t quite reach. The rotors are 13". I need a slightly smaller adapter for this brake kit. Is there a web site or someone that has done this. First time posting.