1998-05 CHEVROLET. Bumper retainer nut. Front. W/O XTREME. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Exhaust System Hanger. Bumper Face Bar Nut. Bumper Impact Bar Nut. Exhaust System Part that holds the Exhaust parts to the vehicle. brace. Impact Bar. TY. Exhaust System Hanger. Face Bar. Inner bracket U -. Mount bracket. Outer REINFORCED. Retainer.