These disc brake conversion kits are everything you need to convert your 1959-60 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. The wheel assemblymounts to your original spindle making installation a snap and includes the original 5 x 5″ bolt pattern. Factory 15″ wheels may require wheel spacers for caliper clearance. Power booster kit bolts directly to the firewall and works with your factory brake pedal. Fits El Dorado and DeVille rear wheel drive vehicles.