Hey Mozzie,

From my experience it is probably easier to get a after market HID kit then swap for OEM lights. You can easily tell if you have the halogen bulbs if you look under the hood at the light housing. If you can twist out your low beam bulb then you have a halogen. The white xenon lights require electronic boxes called ballasts and are a bit more complicated as far as access to the bulb goes.

The X5 is a bit deceiving because the headlight housing from the exterior looks identical regardless of having halogen or xenon bulbs. That is because the halogen bulbs use the same style projector as the xenon. In any case I am very happy with my swap to OEM xenon headlights...and in the end it did not cost me but a few hundred dollars...and a few hundred hours of my time.