I want to do the Xenon conversion also.
I found these parts but not sure if there is anything else I need.
http://ebmwparts.com/parts/2012/BMW/...iagram=1943045
I've been told that "it cannot be retrofitted because there is to much stuff involved to switch it. You would need the at least both complete headlights all the control modules the xenon bulbs and all the suspension items that would control the adaptive headlights."
I'm not sure what the "suspension items that would control the adaptive headlights" is. I just figured new coding would make it all work.