5311. Left.2003-07. Left.REG & QUAD CAB. Rear. Right.2003-07. Right.REG & QUAD CAB. Socket. Bulb receptacle that connects to Tail Lamp. Headlight Socket. License Plate Light Socket. Turn Signal Light Socket. AND AMPLIFIER; wire. Bulb AND AMPLIFIER. HEAD ASSEMBLY. License Plate. Signal lamp bulb. Tail. Turn Signal. Wire harness.