Fitment Information GMC Sierra (2014, 2015, 2016, 2017, 2018) Fit Halogen Only Specs & Features Adding HID/LED bulbs will void the warranty Low Beam:  HB4 (Included) High Beam:  HB3 (Included) Sold as a pair Warranty: One Year Direct replacement Product Description The Xtune Group has been serving the auto industry for nearly a decade. We are the leading providers of aftermarket lighting, tuning, and styling auto parts in the US. We specialize in the wholesale distribution of automotive products. Our 140,000sqft corporate headquarters is located in the City of Industry, California.The quality lighting products Xtune offers comply with all applicable federal regulations. Unless otherwise noted, all products are DOT Compliant and satisfy Federal Motor Vehicle Safety Standards (FMVSS) code no. 108 and are not only ISO-9000 certified but also ISO-9002 certified as well.As further proof of regulation compliance, our products are also approved by the Society of Automotive Engineers (SAE). State and local laws may vary. Xtune offers a one-year warranty on these headlights when purchased through Redline360 (an Authorized Dealer). Adding HID, LED bulbs or any modifications to the lights voids the warranty.