These kits are everything you need to convert your 1963-68 Cadillac to Power Disc Brakes. This is a true bolt-on kit using the factory holes on the spindle and mounting location on the firewall. Wheel assemblymounts to your original spindle making installation a snap and includes the original 5 x 5″ bolt pattern rotors. Power booster kit bolts directly to the firewall and works with your factory brake pedal.