GMC. Grille assy bolt. Outer. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Roof Headliner to it's mounting point. Bumper Cover Spacer Panel Bolt. Bumper Cover Support Rail Bolt. Grille Bolt. Headlight Mounting Bolt. Headlight Mounting Screw. Headliner Screw. Washer Fluid Reservoir Bolt.