Center support bolt. RWD. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Driveshaft Center Support Bracket to its mounting surface. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Frame Side Member to it's mounting point. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Rocker Panel Reinforcement to it's mounting point. Engine Coolant Reservoir Bolt. Engine Mount Bolt. Part cannot be reused/reinstalled. Suspension CrossMember Bolt.