HID Xenon Bulbs D1, D2, D3, D4, D5
Now sure what HID bulb you need? Go to Philips Automotive Bulb Lookup website, enter your vehicle information, and the site will let you know all the bulb types your car or truck uses.
D1R D2R - use in REFLECTOR headlights
D1S D2S D3S D4S D5S - use in PROJECTOR headlights
D2C D4C - use in PROJECTOR headlights - C designates UNIVERSAL fit so it can be substituted for D2S D4S
D1R D1S D3S D5S - have built-in igniters at the bottom of the bulb base