This thread is of interest to me Sky-chicken and I will be watching it with interest as I am looking at changing my Halogen headlights on my E70 X5 to Xenons and have found a pair of OEM E70 Xenons for $1600 with all the wiring and mounting brackets required. Phoned up BMW today and they said it was going to be $4k just in parts itself, good to know now that I don't need to remove the front bumper or the fenders on each side to gain access to the fixings that needed to be removed. Keep me posted. A detailed DIY on how to do the change over will help a lot.