Differential mount bolt. Sedan/Wagon. W/AWD. 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. Differential Carrier Bolt. Part cannot be reused/reinstalled. Carrier. Housing.