Nilight LED Third Brake Light for Chevy GMC Silverado Sierra 1999–2006 Red — 18 LEDs, Direct-fit

Nilight's red LED third brake light replaces the factory center high-mount stop lamp on select Chevy and GMC pickups (1999–2007), delivering brighter, faster, and more durable illumination.

This aftermarket LED third brake light is designed as a direct-fit upgrade for Chevrolet Silverado and GMC Sierra models listed below, swapping into the OEM location while offering improved visibility and weather resistance. Constructed from OE-grade materials and populated with 18 high-efficiency LEDs (8 for braking and 10 for cargo illumination), the unit aims to be a long-lasting, low-maintenance replacement that installs without cutting or complex wiring changes.

Will this Nilight lamp fit my Silverado or Sierra?

The light is engineered to match the factory mounting points on many Silverado and Sierra trucks from 1999 through 2007, including specific HD Classic variants. It replaces certain OEM part numbers for a straightforward changeover.

• Compatible models: Chevrolet Silverado & GMC Sierra 1500/2500/3500 (1999–2006), Silverado & Sierra 1500HD/2500HD/3500HD (2001–2006)
• Also fits: Chevrolet Silverado & GMC Sierra 1500/2500/3500 HD Classic 2007—only the 2007 HD Classic model
• Replaces OEM part numbers: 5978318 and 923240

How bright and reliable is the LED array?

This Nilight lamp uses 18 integrated LEDs arranged to serve as both the center brake lamp and a cargo/bed light. LEDs illuminate faster and generally last much longer than halogen bulbs, helping ensure the lamp remains visible in normal driving conditions.

• LED count: 18 total (8 brake-mode, 10 cargo-mode)
• Performance: Brighter and quicker to light than typical halogen OEM units
• Durability: OE-grade components for extended service life

Is it waterproof and weatherproof for year-round use?

The housing features a dense foam gasket and a sealed design to prevent water intrusion from rain, snow, or road spray. For the most reliable long-term sealing, the manufacturer recommends applying a bead of butyl sealant around the fixture after installation.

• Ingress protection: IP67-rated sealing approach with foam gasket
• Recommended step: apply butyl sealant around the assembly for extra waterproofing
• Included: high-density foam pad for mounting and sealing support

How difficult is installation and what comes in the box?

Installation is intended to be plug-and-play using your truck's existing wiring and factory screw locations—no drilling required. Using the original screws and a hand screwdriver is advised to avoid overtightening and cracking the housing.

• Installation: plug-and-play, use factory screws; no drilling needed
• Tools: hand screwdriver recommended (avoid power tools to prevent cracking)
• Package contents: 1 LED third brake light and 1 high-density foam pad

Who is this for?

This Nilight LED third brake light is aimed at owners of compatible Chevrolet Silverado and GMC Sierra trucks who want a direct-replacement upgrade for improved visibility and resilience in wet conditions. It's a practical choice if your stock CHMSL has dimmed, suffered weather damage, or you prefer the faster response and longer life of LEDs while retaining factory mounting points and appearance.