Front shield nut. 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. Cowl Insulator Nut. Baffle. Center. Cowl Insulator. Floor Pan Splash. Heat. Insulator pad. Muffler. Sound absorber. Tank. Transmission tunnel.