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; For 2007, Compatible with Classic Models ONLY Compatibility - 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; OEM Part Number: 15166756, 15166757, 125104011, 125103011 High Brightness - Higher luminous efficiency and lower power consumption can release more luminous flux. It provides better field of view and visibility compared to other headlights, with longer and wider lighting distances 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. Comes with a complete set of headlights, including Driver (Left) & Passenger (Right) sides. High Beam: 9005/Low Beam: 9006 (Bulbs 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.