Bumper cover nut. Front. W/4S. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Exhaust Pipe Heat Shield. Bumper Cover Support Rail Nut. Nut to secure Bumper Cover. Center Support grommet. Clip. End plate U -. Exhaust Heat Shield. Inner bracket. Lock. Mount strap retainer. Retaining BRACKET U -. Side bracket. Speed 4.8. Stud plate. Support Rail.