This disc brake conversion kit is everything you need at the wheel to convert to disc brakes on your 1961-64 Buick Lesabre, Electra or Wildcat. A true bolt-on kit using the factory mounting holes on the spindle. Precision laser cut .375" thick caliper brackets allows for a perfect caliper fit. These kits mount to your original spindle making installation a snap and include 5 x 5" bolt pattern rotors. For ultimate performance combine with our power brake booster.