These kits are everything you need to convert your 1961-62 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 assembly mounts to your original spindle making installation a snap and includes the original 5 x 5″ bolt pattern. Power booster kit bolts directly to the firewall and works with your factory brake pedal.Prop valve lines exit the master on the engine side, so no fenderwell modifications are required.