Door trim panel nut. Front. Left. Right. A Nut used to retain the Speaker Cover to it's mounting point. A solid metal or plastic block with a threaded hole in the center which is used to secure the Door Insert to it's mounting point. Door Interior Trim Panel Nut. Wheel Arch Molding Nut. SPECIAL. Filler. Handle, inside. Insert. Interior. Speaker Cover. Speaker grille. Wheel Arch Molding. Wheel Opening Molding.