5610. Bumper. W/COMPOSITE. A component that insulates or isolates the License Plate Bracket from another component or it's mounting surface. A rubber Bumper / stop, located in the vehicle's fuel door jam, used to cushion the vehicles door when swung closed. F/TNK FIL DOOR. Fuel Door Stop. License Plate Bracket Insulator. Stopper. Included with: Fuel door.