PIT66 LED 3rd Brake Light for 1999–2007 Chevy Silverado & GMC Sierra — Foam-Sealed, Plug-and-Play

If your Silverado or Sierra from 1999 through 2007 needs a reliable, high-visibility third brake light, this PIT66 unit is built to match OEM fitment while upgrading illumination and durability. It is designed to directly fit many 1500, 2500, 3500 and HD models (Classic and regular) and corresponds to reference part numbers 5978318 and 16525205. The assembly offers bright LED output, a foam-sealed housing to keep moisture out, and a straightforward installation path for most owners and technicians.

How bright and visible is this third brake light?

The PIT66 LED assembly produces a clear, crisp stop signal that improves recognition versus aging incandescent bulbs. The LED array lights quickly and maintains consistent brightness over time, which helps other drivers notice braking sooner.

• LEDs provide faster illumination than incandescent bulbs
• Designed for even light distribution across the lens
• Improved visibility in daylight and low-light conditions

Will it fit my 1999–2007 Chevy Silverado or GMC Sierra?

This brake light is specifically manufactured to match the mounting, connector, and dimensions of 1999–2006 and 2007 Classic Chevrolet Silverado and GMC Sierra 1500, 2500, 3500 and HD models. Before purchase, confirm your truck’s year and model and compare the reference part numbers 5978318 and 16525205 to ensure compatibility.

• OEM-style form factor for direct replacement
• Reference part numbers included for cross-checking
• Fits both standard and Classic body variants where specified

How durable is the unit — will it resist weather and road grime?

The housing is sealed with high-density foam and engineered to prevent water, mud, and snow intrusion that commonly cause corrosion or failure. This weatherproofing helps the light remain reliable through wet and winter conditions.

• Foam-backed seal for water and dust resistance
• Rust-resistant materials and secure mounting points
• Lens designed to withstand road spray and debris impact

How difficult is installation and what’s included?

Installation is intended to be straightforward and mirrors the factory replacement procedure; professional installation is recommended if you’re uncomfortable working with vehicle electrical connections. The product ships as a complete LED third brake light assembly ready for mounting and connection.

• Comes as one complete LED third brake light unit
• Designed for direct bolt-in and plug-in where factory connectors match
• Minor trimming or connector adapters may be needed on some models

Who this is for: Drivers and technicians who own a 1999–2007 Chevrolet Silverado or GMC Sierra and want an OEM-compatible upgrade that improves brake-light visibility and resists weather-related failure. It’s a practical replacement for faded, cracked, or malfunctioning factory third brake lights and suits fleet maintenance, restoration projects, and everyday truck owners seeking a durable, high-visibility solution.