These kits are everything you need at the wheel to convert to disc brakes on your 1965-68 Chevy Impala. These kits include our unique one piece caliper bracket and mount to your original spindle making installation a snap! These kits also use a D154 GM caliper which allows the use of 13″ wheel combos and works well with 14″ aftermarket wheels. .375″ material caliper bracket exceeds GM specifications