A headlight (headlamp) is a lamp attached to the front of a vehicle to light the road ahead. Headlight performance has steadily improved throughout the automobile age, spurred by the great disparity between daytime and night time traffic fatalities. Headlights are one of the most important components of your vehicle; they allow you to see the road in front of you clearly during the night and in any bad weather that may arise. Our headlights upgrade the face of your vehicle with clear style and extreme range. Replace for 2001 GMC Sierra C3 02-06 GMC Sierra 1500 Denali 07 GMC Sierra 1500 Denali Classic 01-06 GMC Yukon Denali 01-06 GMC Yukon XL 1500 Denali