Jack assy U-nut. SPARE WHEEL. A Nut used on a floor jack. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the HVAC Case. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Radiator Fan Shroud. Bumper Cover Support Rail Nut. Fender Nut. Fender Support Nut. Hardware used to attach Bumper Cover to the vehicle. Headrest Guide Nut. Included in cooling module. Nut to secure Bumper Cover. Quarter Panel Splash Shield Nut. Radiator Mount Nut.