Our 1949-54 Chevy Belair, Fleetline disc brake conversion kit uses Lg. GM calipers for more friction surface area and improved stopping power. These kits mount to your original spindle making installation a snap! Caliperbrackets are made of .375″ 1018 mild steel exceeding OE specifications and no deflection.Works with after market 14″ wheels. 15″ wheels recommended.