C10 Rear Disk Brake Conversion Kit. 1971-1987 Chevy C10. 2 - Red GM Single Piston Calipers Loaded (Pads Included). 2 - 11-9/16" Zinc Plated Drilled & Slotted Rotors (5x5 Lug Pattern). This kit converts your old drum brakes to modern disk brakes with drilled and slotted rotors!