Deflector nut. Left.1998-05 CHEVROLET. Right.1998-05 CHEVROLET. W/XTREME. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Door Armrest. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the HVAC Case. Fender Nut. Nut that secures the grille. Nut to secure bumper cover. Rocker Panel Molding Nut. Valance Panel Nut. Wheelhouse Nut.