The Genuine Ford Tail Lamp Assembly Nut W711079-S300 is a direct replacement part for Ford and Mercury vehicles, specifically models such as the F-150, Explorer, and Mountaineer. This OEM nut is sold separately and is included in the diagram as part reference #3. It is designed for years ranging from 2006 to 2020, providing a secure fit and maintaining the authenticity of the vehicle's lighting and lamps system. This product ensures quality and compatibility with Ford vehicles, making it an essential component for proper tail lamp assembly.