Fitment：Compatible with Chevy Silverado/GMC Sierra 1500 2500 3500 1999-2006, Compatible with Chevy Silverado/GMC Sierra 1500HD 2500HD 3500HD 2001-2006, Compatible with Chevy Silverado & GMC Sierra 1500 2500 3500 & HD Classic 2007, NOT Compatible with Old Body Style Models 1999, NOT Compatible with New Body Style Models 2007. Excellent Lens: The Lens of the brake light is made of excellent materials, the structure is sturdy and durable, and the color will not fade after a long time of use. Waterproof: 3rd Brake Light cover is padded with high-density foam back and is perfectly sealed around, preventing water, mud and snow leaking in. OE Standard:Meets the Original Equipment (OE) standards.Interchange Part Number:5978318, 16525205, 923240. Installation: The 3rd brake light cargo lamp is no more drilling needed. Pay attention to the position alignment when installing brake Light, correctly link the wiring harness, professional installation is strongly recommended. LED Bar 3rd Third Brake Light, Compatible with Chevy Silverado/GMC Sierra 1999-2007, High Mount Rear Tail Stop Light Cargo Lamp, Smoky Lens Clear Housing