I have a NIB Euro light switch imported from Germany. Activates rear fog function in your E9X series cars. 5 minute install.
$100 +shipping
Best to email
bill_be3@comcast.net
FYI:
US cars can have the rear foglights enabled by replacing the light switch with the Euro version. These are the same lamps already installed as adaptive brake lights. While the rear fogs are switched on, the adaptive brake light function is disabled.
Parts required- 61 31 6 932 796 ...
http://www.e90post.com/forums/showthread.php?p=6444663