PIT66 LED DRL BAR Headlight Assembly for 1999-2007 GMC Sierra - Direct

In this review the PIT66 LED DRL BAR Headlight Assembly is evaluated for owners of late 1990s and 2000s GMC trucks who need a full replacement headlight set. The bottom line: it is a straightforward direct replacement that improves night visibility through a micro-prism reflector and chrome interior, and it includes both left and right housings for a complete swap; professional installation is recommended. For those running Denali trims or nonclassic 2007 models this unit is not compatible.

Key Features

• Compatibility: Covers a wide range of GMC models including 1999-2007 Sierra 1500 and 2001-2007 Sierra 2500 HD, so owners of those trucks can replace both sides at once.
• Reflectivity: The micro-prism reflector and chrome finish boost light reflectivity to help oncoming drivers notice the vehicle at night.
• Sealed Housing: A fully sealed heavy-duty plastic housing offers impact and weather resistance to extend service life in road conditions.
• Moisture Management: One-way venting helps dissipate accumulated moisture to reduce fogging and prolong headlight life.
• Direct Replacement Fit: Designed as a direct swap with no extra gaps when installed properly, and it ships as a complete left and right set for convenience.

Who It's For

This assembly is best for GMC Sierra and Yukon owners from the covered year ranges who need a full headlight housing replacement and value a sealed, OEM-style unit with improved reflectivity. It is particularly useful for drivers who want both sides replaced together and prefer housings designed to match factory mounting points.

It is not suitable for owners of Denali trims or 2007 non-classic models, and buyers expecting included bulbs should note that bulbs are not provided. Anyone uncomfortable with vehicle electrical or alignment work should plan a professional installation.

Pros & Cons

Pros

• Complete left and right headlight housings make it easy to replace both sides at once.
• Improved reflectivity from the micro-prism reflector and chrome interior increases night visibility.
• Durable, fully sealed plastic housing resists weather and minor impacts.
• One-way venting helps manage moisture and reduce internal fogging over time.

Cons

• Bulbs are not included, so additional purchase and matching are required for installation.
• Customer feedback on fit and brightness is mixed, so fitment should be confirmed before purchase.

Specifications

Brand	PIT66
Compatibility Years	1999-2007 (specific models listed)
Compatible Models	Sierra 1500/1500 HD/2500/2500 HD/3500, Yukon, Yukon XL
OEM Part Numbers	15166756, 15166757, 125104011, 125103011
Housing	Fully sealed heavy-duty plastic with chrome interior
Vent Design	One-way vent to dissipate moisture
Included	Driver (left) and Passenger (right) headlight housings; bulbs not included

Our Verdict

The PIT66 LED DRL BAR Headlight Assembly is a sensible, value-oriented direct replacement for compatible GMC Sierra and Yukon models that improves reflectivity and resists moisture with a sealed housing. It offers good durability and a complete left/right set, making it a practical choice for owners needing a replacement housing, though buyers should budget for bulbs and consider professional installation to ensure proper fit and alignment.

Frequently Asked Questions

Are bulbs included?
No, bulbs are not included; you will need to purchase compatible bulbs separately.

Will this fit Denali trims?
No, this assembly is not compatible with Denali trims.

Does it prevent fogging?
The one-way vent design helps dissipate moisture and reduce fogging, but proper installation and sealing are important for best results.