【Direct OEM Fitment】Headlight Assembly Replacement for 1999-2006 Sierra 1500/1999-2006 Sierra 2500 HD/3500 HD Headlights.High Beam: HB3, Low Beam: HB4（Bulbs not included） 【IP65 Excellent Waterproofing】IP65 certified fully sealed structure; premium PC lens and PP housing with tensile/impact strengths; perfect for rainy days, snowy days, bumpy mountain roads, etc. 【Superior Brightness】High-definition visual quality; high/low beam reflector bowl made of BMC; 98% reflection rate ensures great light output. 【Plug-n-Play】Bolt-on design for easy plug-n-play installation; no need to modify the vehicle; installation process for 15 minutes or less. 【100% return for quality issues】：One year long warranty. If you encounter any problems, please feel free to contact us through the "Ask a Question" button.We are always happy to help and are committed to providing a responsive solution. 【100% OE Fitment】Perfect fitment for OE Type 1999 2000 2001 2002 2003 2004 2005 2006 GMC Sierra 1500 2500 3500 / 2007 GMC Sierra 1500 2500 3500 classic / 2000 2001 2002 2003 2004 2005 2006 GMC Yukon 1500 2500 XL (Does not fit 1999 Sierra Old Body Style / 2007 Sierra New Body Style models) 【Direct OEM Fitment】Headlight Assembly Replacement for 1999-2006 Sierra 1500/1999-2006 Sierra 2500 HD/3500 HD Headlights.High Beam: HB3, Low Beam: HB4（Bulbs not included）