Dorman 1591840 Headlight Assembly - Left

OE-Style Left Headlight Assembly

This Dorman headlight assembly is a direct replacement for the original left-side lamp on select Chevrolet Silverado and Avalanche models. It is reverse-engineered to match the stock headlight’s look, fit, and function while helping reduce dealership-level replacement costs.

Built for 12.8-volt systems, this assembly includes clear plastic lens construction, a plastic housing, and halogen bulb technology for a factory-style exterior lighting repair. It is street legal and comes with bulbs installed for a straightforward replacement on the driver-side front end.

Key Features

• Brand: Dorman
• Part number: 1591840
• Left headlight assembly for exterior lighting repair
• Clear lens with plastic lens material
• Plastic housing for OE-style fit and appearance
• Halogen bulb technology
• Bulbs included
• Street legal
• 12.8-volt electrical specification

Detailed Description

Dorman 1591840 is a replacement headlight assembly engineered for specific Chevrolet Silverado and Avalanche applications, including 2005-2006 Chevrolet Avalanche 1500 and Avalanche 2500 with Decor Package, plus 2005-2006 Chevrolet Silverado 1500, Silverado 1500 HD, Silverado 2500, Silverado 2500 HD, and Silverado 3500. It also fits 2007 Chevrolet Silverado 1500 Classic, Silverado 1500 HD Classic, Silverado 2500 HD Classic, and Silverado 3500 Classic in the left position. This part cross-references TYC 20-6386-90 for the same application.

For buyers searching for a left headlight assembly for 2005-2006 Chevrolet Silverado 1500 or a replacement headlamp for 2007 Chevrolet Silverado 2500 HD Classic, this unit provides a direct-fit solution that follows the original lamp layout. The clear lens and halogen setup support a factory-style exterior appearance on compatible Chevrolet Silverado and Avalanche trucks.

What It Helps Fix

• Cracked or cloudy left headlight lens
• Dim or failed halogen headlamp output
• Water intrusion from a damaged housing
• Restoring front-end lighting after collision damage
• Replacing a worn OE-style headlamp assembly

Installation Notes and Tips

Verify the vehicle’s year, model, and left-side application before installation. Confirm bulb and connector condition during replacement, and inspect the mounting points and surrounding trim for damage that could affect alignment. For best results, aim the headlight after installation to maintain proper road illumination.

Quality Assurance

This Dorman replacement headlight assembly is reverse-engineered to match the original equipment design for the listed Chevrolet applications. It is built to provide a factory-style replacement option for Silverado and Avalanche owners who need a direct-fit exterior lighting repair.