Left. Right. Trailer hitch nut. A Nut which secures the trailer hitch receiver to the vehicle. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Seat Frame. Automatic Transmission Mount Nut. Bumper Cover Support Rail Nut. Bumper Face Bar Mount Nut. Bumper Face Bar Nut. Manual Transmission Mount Nut. Nut for the Engine Mount. Nut to secure Bumper Cover.