Ok cool that's strange they where posted last week!!! Anyway if you want the aluminum ones just ask 
Wanted: Stereo Knob
- Thread starter Ed Doe
- Start date
Yep they should fit all BM stereos. They look better with the matching handbrake and gear knobs though!!
http://www.z4-forum.com/forum/viewtopic.php?f=7&t=67269&hilit=gear+knobs&start=45#p1019892