CREW CAB. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Roof Headliner. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Roof Rail Reinforcement. Bumper Face Bar Mount Nut. Bumper Face Bar Nut. Nut that secures the Radiator Shutter Assembly. SunRoof Frame Nut. Valance Panel Nut. Hex. Actuator U -. Bumper Face Bar Mount. Headliner. Insert Panel. Mount bracket. Mount plate lock. Radiator Shutter Assembly. REINFORCED. Roof Side Rail Reinforcement. SunRoof Frame. Support. Valance U -.