FordPartsGiant.com offers the wholesale prices for genuine 1985 Ford Mustang parts. Parts like Disc Brake System - W/Rear Disc Brake Brake Assy. - Drum Rear Brake Cylinder Assy. - Rear Drum are shipped directly from authorized Ford dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 3.8L. Transmission: 4MT.