UMI Performance 78-88 GM G-Body C5/C6 Front Brake Conversion Hubs Bearings Bracket KitUMIs C5 C6 conversion kit includes laser cut UMI conversion brackets, light weight USA made aluminum hubs and premium bearings. P N 304647 includes everything needed to adapt the C5 C6 abutment brackets, calipers and rotors to the G Body spindles. The hub features 5 x 4 1 2 and 5 x 4 3 4 bolt patterns and is intended to face mount the C5 C6 brake rotor in exact factory location (front track width is unaffected). The kit includes premium bearing cups