This system features the 4-piston, T4 caliper mounted to a 13", 1 piece slot, drill, zinc plated rotor. The T4 caliper has D.O.T compliant dust and weather seals and uses the popular D0749 pad type. Billet aluminum hubs come assembled with premium bearings packed with Redline synthetic grease and billet dust caps. All mounting brackets, stainless braided hoses and hardware are also included. The 13" Track4 is designed to fit most 17" or larger wheels. | Rotor Size/Type: 13" x 1.10", 1-piece | Replacement Rotors: 6910084 (Left) / 6920084 (Right) | Caliper/Piston Count/Mount Type: T4 / 4-piston / Radial | Replacement Pads: D0749R | Minimum Wheel Size: 17" (Use template to verify fitment, link below) | System Includes: Calipers, Brake pads, Rotors, Billet aluminum hubs w/premium bearings, Billet dust caps, Brackets, Stainless braided brake hoses & mounting hardware | Notes: - No Track width change compared to stock disc brakes - Widens track .200" a side on stock front drum brake cars - Designed to be used with OE GM disc or drum spindles | Applications: - 1964-72 GM A-Body cars w/OE spindles - 1967-69 GM F-Body cars w/OE spindles - 1964-74 GM X-Body cars w/OE spindles Also Fits: - DSE AFX-body 2" drop spindles - Heidts 2" drop spindles - Fatman 2" drop spindles - Ridetech 2" drop spindles - L&H Customs spindles