KarSpareHub Halogen Headlights for GMC Sierra/Yukon 1999–2007 – Direct-Fit, Sealed Assemblies with HB3/HB4 Bulbs

KarSpareHub halogen replacement headlights are direct-fit, weather-sealed headlamp assemblies engineered to replace the factory units on compatible 1999–2007 GMC Sierra and 1999–2006 Yukon models.

These headlight assemblies are built to match OEM dimensions and mounting points so they install cleanly without modification. Each lamp comes with the proper HB3 low beam and HB4 high beam bulbs installed, a UV-protected lens, and a sealed housing designed to resist moisture and road debris. The assemblies are tested for fit and finish using the listed OEM part references to ensure correct alignment with your vehicle’s styling and electrical connectors.

Which GMC years and trims does this replace, and what part numbers match?

These headlights are modeled to replace the factory lamps on 1999–2006 GMC Sierra 1500/2500/3500 and 2007 Sierra classic 1500/2500/3500, plus 2000–2006 GMC Yukon 1500/2500 XL. They are not compatible with the 1999 Sierra old-body-style or 2007 Sierra new-body-style models. Reference OEM numbers are provided for cross-checking before purchase.

• OEM references: 15850351, 15850352
• Partslink cross: GM2502188, GM2503188
• Compatibility note: excludes certain old/new body variants

How do these headlights hold up to weather and road conditions?

Each assembly uses a polyurethane (PUR) adhesive bead and a one-way breathable film to create a durable, watertight seal that resists fogging and ingress. Units undergo an air-tightness inspection to confirm the seal integrity and the coatings protect the lens from UV damage and yellowing over time.

• Sealed with PUR adhesive for waterproofing
• One-way breathable film stabilizes internal humidity
• UV optical coating minimizes lens yellowing

What kind of light output and bulbs are included?

The assemblies arrive with HB3 sockets for low beam and HB4 sockets for high beam bulbs installed, delivering reliable halogen output suitable for highway and city driving. They meet SAE standards for beam pattern and brightness, providing clear forward illumination while maintaining proper cutoff to reduce glare.

• Included bulbs: HB3 (low) and HB4 (high)
• SAE-compliant beam pattern and brightness
• Optical coating keeps lens clarity over time

How easy is installation and what warranty coverage is offered?

These headlights are built for bolt-on replacement and align with factory mounts and electrical plugs, so installation can be done at home or by a professional. If you want step-by-step guidance, reply "DIY" for detailed instructions. The product includes a 3-year limited coverage for defects under normal use; claims require order information and photos.

• Direct-fit mounting and factory-style connectors
• DIY-ready with optional installation instructions
• 3-year warranty with simple replacement/refund process

Who is this for: drivers restoring or maintaining late‑model GMC Sierra (1999–2007 classic variants) and GMC Yukon (2000–2006 XL) who want a direct-fit, OEM-referenced halogen headlight that resists moisture and lens aging. Choose these assemblies if you need a drop-in replacement with included HB3/HB4 bulbs, sealed construction for durability, and a multi-year warranty for peace of mind.