my friend managed to get it from a Tii showcar when he was in Germany.
apparently the one (or at least the Tii concept) and three series use the same SW.
lucked out...
i think the guy that did my custom wheel can re-wrap stock E9x SWs in alcantara.
You can try contacting Tommy at
http://www.robson-design.com/english/profile.htm
cheers