GTR Ultra D1C HID Bulbs: Direct Replacement for your OEM HID D1S or D1R application. Ultra HID D1R bulbs are manufactured from German made Philips UV quartz glass which helps provide more light on the road as well as the highest level of resistance to vibrations, extremes of temperature, and risks of explosion. Ultra HID D1C bulbs are designed to work with any D1S or D1R style ballast and fog light.
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