Sorry, no again. If I do open the other mirror for cleaning, I will remember to write down the part number and take some pictures.
http://www.xoutpost.com/x5-e53-forum/...irror-led.html (3rd image) show a good photo of the mirror motor casing (note the three torx screws) and next to it the plastic piece is where the microswitch is encased - you can lever it and it will slide out showing the microswitch.