GM 10/12 Bolt Rear Disc Brake Conversion Kit, 1963-1970 GM C10/C15 Series Trucks, 6 x 5.5 in. Wheel Bolt Pattern, Standard Kit w/E-brake, Includes:, Calipers, Brackets, Flanges, Plain Rotors, Brake Hoses, E-brake Cables|JEGS GM 10/12 Bolt Rear Disc Brake Conversion Kit for 1963-1970 GM C10/C15 Series Trucks, 6-Lug [Standard kit with E-Brake].