True bi-xenon doesn't use two bulbs -- it uses a moving lens/reflector system with a single bulb and a good projector. I have bi-xenon projectors in my Cayenne, and they are the most incredible headlights I've ever had in any car, bar none.

Sorry, I can't help you with the other particulars of your car. I can tell you that you really want proper, well-designed projectors for this kind of project, though. Just slapping in xenon bulbs is less than idea, because the reflectors in ordinary lamps are set up to focus on the halogen bulb. The "flamefront," if you will, is different on the two types of bulbs, and can result in a mis-focus of the light if done poorly.

Also, I believe federal rules requires HID lamps to be self-leveling. It's going to be hard for them to enforce anything on you if you install fixed lamps, but it's still not the right thing to do. Those things are wicked bright to oncoming traffic if not adjusted properly. (It's also why most after-market kits come from Asia.) Try to get it right if you can. My factory bi-xenons self level.

Good luck with the project!

Cheers, John

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'98 E300TD (W210) | Sold 6/09 with 205k and counting
'04 VW Touareg V10TDI