I give Patryk and bimmertech a big thumbs up :-) Just completed a successful CIC retrofit, by purchasing a full kit from them. Went extremely smoothly, and a totally awesome experience. Highly recommended.
The last thing I wanted to do was purchase a bunch of random parts off ebay, in the hope they might work. I wanted to install something, I knew was going to work and had being previously tested in a integrated way. If that meant paying a bit extra, it was worth it to me at least.
http://www.xbimmers.com/forums/showthread.php?t=589250