The MTD 7480856 Bevel Gear Z42 is an authentic OEM replacement part designed for use in various MTD, Cub Cadet, and Troy-Bilt riding lawn mowers. This metal bevel gear is a critical component of the transmission assembly, ensuring proper power transfer. It is sold individually and is compatible with models such as RZT-S42, RZT-SX42, RZT-S46, RZT-SX46, RZT-S50, RZT-SX50, RZT-S54, and RZT-SX54. Refer to the owner's manual for correct application and installation.