Bezel nut. Left.CREW CAB. Right.CREW CAB. A solid metal or plastic block with a threaded hole in the center which is used to secure the Curtain Air Bag Inflator Module to its mounting point. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Backup Sensing System Module. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Seat Belt Guide. Rear Body Panel Trim Panel Nut. Starter Nut. Back. Bezel. Body Trim. Curtain Air Bag. Head Air Bag. Parking Aid Control. Seat Belt Guide. Starter.