Left.FWD. Right.FWD. A threaded rod with a drive head (such as hex, 12 point, torx, etc) on one end used to secure the Differential Housing Mount 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 Differential Housing to it's Mounting point. Part cannot be reused/reinstalled. Suspension Crossmember Bolt.