The Wilwood Zero Offset Rotor Adapter for Wide-5 Direct-Mount Hubs adapts any standard fixed mount rotor hub with an 8 x 7.00” bolt circle, to a dynamic rotor mount. Adapter is supplied with a standard 8 x 7.00” pattern for hub mounting and an 8 x 7.00” dynamic pattern for rotor mounting. Made from high strength aluminum alloy and hard anodized for wear resistance. Use Dynamic mount bolt kit part # 230-14845 and Adapter to hub bolt kit 230-8390.