2023-24. BUMPER COVER & TRIM. Lower cover U-nut. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Brake Cooling Duct. Bumper Cover Stay Nut. Bumper Trim Nut. Nut to secure Bumper Cover. Spoiler Nut. Tail Light Clip. Valance Panel Nut. Included with: Bumper Cover, Tail lamp assembly.