2007-11. Bumper cover U-nut. GRAND MARQUIS. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Door Latch. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Door Lock Cover. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Floor Pan Heat Shield. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Floor Pan Splash Shield. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Liftgate. Bumper Cover Support Rail Nut. Nut securing the interior Door handle. Nut to secure Bumper Cover.