Made to match: Our 3rd brake light assembly is designed for 2014- 2018 Chevy Silverado 1500/GMC Sierra 1500, 2015-2019 Chevy Silverado 2500HD 3500HD/ GMC Sierra 2500HD 3500HD, 2019 Chevy Silverado 1500 LD/GMC Sierra 1500 LD, OEM Part No: 23509162, 20979071, 84900397 Upgraded Strobe Brake Lights: Equipped with the latest design- F1 Style fast strobe, the silverado 3rd brake light led will flash 5 seconds when stepping on the brake then stays fully on until you lift your foot off the brake, which can be turned on/off by the switch behind third brake stop light refer to your preferences, more noticeable to avoid rear end accident Ultra Bright LED Illumination: Built-in upgraded full laser high power SMD LED chips compared to stock lamp, Sierra 1500 brake light appears 2X brighter then OEM, allows you to unload safely at night or reminds the driver behind you that you are braking. The highly light-transmissive PC lens provides a fantastic look while optimizing light output and preventing fading Weather-sealed Waterproof: High-density foam mounted back and fully sealed PC/ABS front, Silverado led brake light prevent any sand, dust, water, snow and shock leaking in, make sure this stoplight will work perfectly in all weather, you can also put some silicone/gasket to help seal it for double protection 10-minutes Plug Play Install: Directly remove OEM light and put our cab brake/cargo light in, no drilling, re-wiring or modification need, easy complete the installation in 10 minutes. We recommend use the factory screws for installation, which will help the lights fit perfectly into the truck. DOT/SAE approved, legal on road. 24-hours professional customer service to solve concerns you have