GM Rear Disc Brake Conversion Kit1964-1972 GM A-BodyPremium Kit Non E-BrakeIncludes:11 in. Cross-Drilled/Slotted Rotors w/ 5 x 4.750 in. & 5 x 4.500 in. Dual Bolt PatternsRaw CalipersSee Special Note Below JEGS 630612 GM 10 & 12 Bolt Rear Axle Disc Brake Conversion Kit with cross-drilled and slotted rotors without e-brake is an easy bolt-on solution for upgrading your GM rear-end to disc brake performance. This kit is designed for GM rear axles with coil springs and shocks that mount on the backside of the axle housing.Note:Will NOT Fit These Applications: Axle Flange is too large to fit into the hat of the rotor. See the above dimensions before ordering.1964-1965 LeMans,.