Add the safety, reliability and performance of rear disc brakes to your vehicle with our GM 10 bolt rear drum to disc brake conversion. In this rear brake conversion kit, you receive everything you need to mount single piston disc brakes to your GM 10 Bolt 7. 5" or 8. 5" Rear Axle. All components used in this 10-bolt General Motors rear disc brake conversion kit are new high quality, precision machined products with a zinc plated finish to reduce corrosion and extend the life of your brake system. The heavy duty parking brake caliper will allow you to use your stock parking brake cables to actuate your parking brake. Position: Rear, Rotor Included: Yes, Rotor Style: MaxGrip Construction: Cast Iron, Rotor Diameter: 11 in, Rotor Thickness: 1 in, Caliper Included: Yes, Caliper Piston Quantity: 1, Caliper Material: Cast Iron, Caliper Finish: Black Powder Coated, Parking Brake Included: Yes, Minimum Recommended Wheel Diameter (in): 15x7.