I wouldn't be looking on ebay. Most of those HID kits are crap.

If Xenith Xenons is still around in the sponsors section, I highly recommend buying from him. His kits are $250 shipping and have everything you need to get them wired in.

I wouldn't put a 9005 HID bulb into a 9006 socket. Technically, you could do it, but the life expectancy on those bulbs is much shorter than the 9006 low beam bulbs.