5311. Front. Left.4WD. Right.4WD. W/DUAL REAR WHEELS. Wheel bolt. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Hub Extension to it's mounting point. A threaded Stud that secures a vehicle's Wheels to the Wheel Hub. Wheel Lug Bolt. and bearing. and bearing s. Lug. Included with: Extension, Hub assembly.