Compatibility - Compatible with 1999-2007 GMC Sierra 1500/2001-2007 Sierra 1500 HD; Compatible with 1999-2004 GMC Sierra 2500/2001-2007 Sierra 2500 HD; Compatible with 2001-2007 GMC Sierra 3500; Compatible with 1999-2006 GMC Yukon; Compatible with 2000-2006 GMC Yukon XL 1500/Yukon XL 2500; Compatible with 2001 GMC Sierra C3; NOT Compatible with Denali Trims; For 2007, Compatible with Classic Models ONLY. OEM Part Number: 15166756, 15166757, 125104011, 125103011. Brighter & Cooler Lighting - The upgraded headlight assembly adds LED DRL, and uses special fine chrome plating to increase brightness and ultra-wide angle，making the vehicle more special. Safety & Durability - The micro-prism reflector and the chrome finish inside the headlight increase the reflectivity of the light, making it easier for the oncoming vehicle to notice you at night. The one-way vent design helps to dissipate accumulated moisture and prolong the life of the headlights. Sturdy Sealing Structure - The fully sealed heavy-duty housing is made of high-quality plastic,to ensure excellent weather resistance, impact resistance, and durability. Direct Replacement - Professional Installation would be highly recommended. No extra gaps after easy installation. Comes with a complete set of headlights, including Driver (Left) & Passenger (Right) sides. Bulbs are not included. Compatible with 1999-2007 GMC Sierra 1500/2001-2007 Sierra 1500 HD; Compatible with 1999-2004 GMC Sierra 2500/2001-2007 Sierra 2500 HD; Compatible with 2001-2007 GMC Sierra 3500; Compatible with 1999-2006 GMC Yukon; Compatible with 2000-2006 GMC Yukon XL 1500/Yukon XL 2500; Compatible with 2001 GMC Sierra C3; NOT Compatible with Denali Trims; For 2007, Compatible with Classic Models ONLY; OEM Part Number: 15166756, 15166757, 125104011, 125103011.