Compatibility:Compatible with 1999-2006 Chevy Silverado 1500 2500 3500 & HD Models.Compatible with 2007 Chevy Silverado 1500 2500 3500 & HD Classic Models.Compatible with 1999-2006 GMC Sierra 1500 2500 3500 & HD Models.Compatible with 2007 GMC Sierra 1500 2500 3500 & HD Classic Models Durable Material: This third brake light is made of PMMA and ABS material, which can prevent leakage from water, snow, or heavy rain. The lenses is UV resistant and shockproof,will not easily turn yellow or or crack,and has a long service life Higher Visibility: The bright lights on this third brake light enhance visibility and enhance safety. Bringing a different appearance to the vehicle, with a cool exterior and excellent illumination Easy to Install:Manufactured according to factory specifications, easy to install. Designed to directly replace your original brake lights. It does not include installation guidelines or instructions, so it is strongly recommended to install professionally OE Standard:Meets the Original Equipment (OE) standards, ensuring replacement fit just like the original. Interchange Part Number:923-240, ‎15884341, 19169016, 5978318, 16525205 High Mount 3rd Brake Light w/Bulb Compatible with 1999-2006 Chevy Silverado GMC Sierra 1500 2500 3500 & HD Models/Fit 2007 Chevy Silverado GMC Sierra Classic Models 923-240 15884341