Compatibility: Our 3rd Brake Light Assembly fit for 2014-2018 GMC Sierra, C-hevy Silverado 1500; 2019 GMC Sierra/C-hevy Silverado 1500 LD; 2015-2018 GMC Sierra /C-hevy Silverado 2500HD 3500HD. Easy to install: Plug and Play installation. Simply remove the original light and replace the third stop light, plug the version light into the factory socket and you are ready to go. No modifications to the stock wiring are required. Waterproof function: The third brake light housing is sealed design, the outer material is waterproof rated IP68, product service life is more than 50,000 hours. The waterproofing of the brake light works perfectly in any bad weather such as rain, snow, fog. Braking Function: When you step on the brake, the third brake light comes on synchronously to give a brake warning signal. The bright and penetrating light communicates quickly and clearly to the vehicle behind. Package Included: 1 pcs LED third brake light and 1 pcs foam padded gasket. If you have any questions about the products, please feel free to contact us. We will provide excellent after-sales service, do not need to worry about any product problems! 3rd Brake Light LED High Mount Brake Light Fit for Chevy Silverado GMC Sierra 1500 2500 3500HD 2014-2018