Best mod ever for my 2013 X1!!.
Bought generic replacement from ebay:
http://cgi.ebay.com/ws/eBayISAPI.dll...m=321297286291
Did the mod right in the post office parking lot.
1. Be careful with the plastic nose so you don't scratch it (I was careful).
2. Reset the compass by pushing the reset button until "C", then drive in a small circle. (verify the region code - 11 here in MD).
3. Homelink required me to push the "learn" button on my opener, but other than that - easy.
Now does anyone want to buy a manual mirror?