Bumper cover nut. Front. GT2. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Bumper Cover Heat Shield. Back Glass Wiper Motor Cover Nut. Back Glass Wiper Motor Nut. Bumper Cover Reinforcement Nut. Bumper Cover Support Rail Nut. Bumper Guide Nut. Nut to secure Bumper Cover. Radiator Support Air Duct Nut. Trunk Floor Storage Box Nut. WindShield Wiper Motor Nut.