Bumper nut. Front. STEEL. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Evaporator Case. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Floor Pan Splash Shield. Bumper Face Bar Nut. Wheel Arch Flare Nut. WindShield Washer. Air Conditioning (A/C) Evaporator Core Case. Bumper Face Bar. Floor Pan Splash Shield. Mount bracket grommet. Side cover. Wheel Arch.