Left.COUPE. Outer wheelhouse nut. Right.COUPE. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Liftgate Glass Support Strut. Door Grommet. Door Interior Trim Panel Nut. Wheelhouse Nut. Interior Grommet. Back Glass Lift Support. Blind Rivet. Outer. Pad cap. Support cylinder.