1999-04 W/O SUPERCHARGER. Lower housing insulator. A component that isolates the Antitheft System Horn from another component or it's mounting surface. A rubber ring with a hole in the center which provides protection through which Anti-Theft Alarm Siren related components pass through. Air Filter Housing Grommet. Air Filter Housing Insulator. Engine Air Duct Insulator. Engine Air Intake Resonator Grommet. Engine Air Intake Resonator Insulator. Engine coolant expansion tank mounting Insulator. Minimizes the noise or vibration between the Engine coolant expansion tank and it's mounting point. Engine Cover Grommet. Included with: Air Cleaner, Air Cleaner assembly, Engine Cover, Housing, Lower Housing, Mount bracket, Outlet Duct, Rear Duct, Resonator, Upper Housing.