Module screw. REVERSE SENSING SYSTEM. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Backup Sensing System Module to it's mounting point. Bolt that secures the Bumper Cover. Bumper Cover Screw. Bumper Cover Spacer Panel Screw. and Washer Assembly. Filler. Mount Bolt. Parking Aid Control Module Bolt. Retaining. Side retainer. Spacer Panel. Support.