Replace Only HID Bulbs: Replacement for stock D3S HID headlight bulbs only, NOT ADAPT if your auto has stock Halogen/LED headlight | Ways to Check Bulb Size: Amazon filter systems may not be 100% correct or up to date as 85% of cars that use HID bulbs also have halogen versions. If you are not sure which bulb size your vehicle requires, PLEASE Search "automotive bulb finder" or check if your stock bulbs are HID, or contact us for help | 350% Brightness: Marsauto 35W D3S HID headlight bulbs are 350% brighter than the light output from halogen bulbs and 200% brighter than standard HID lights because it's filled with high-purity xenon gas. Higher brightness illuminates more clearly and farther, allowing drivers to avoid road hazards earlier and gaining 3S more brake response | 3500 Hours Longevity: Marsauto HID bulbs ensure the last 3500 hours lifespan, reducing your bulb replacement frequency. IP67 waterproof design and high-temperature resistance metal base reduce the fog and vaporization damage caused during driving | Easy to Install: 1:1 factory HID bulb design optimizes compatibility, you take only 5 minutes to complete the whole replacement process, and even your wife can easily complete it at home