looks like 6000k should work.
NOVAX5 has them.
http://www.xoutpost.com/x5-e53-forum/...ighlight=6000k
Not sure what else to try, went out to the x tonight to try again and now there just flickering on for a second and not turning on at all.
ahhh no headlights on the x right now, need to figure this out.