I saw a nice homemade one on the web.
Try here:
http://www.unofficialbmw.com/all/dri...djustment.html Ron Stygar is the author, if they re-worked the site and this address is no longer good.
He has a '97 sport ti that he has done a pile of little mods to. Some are cool, some are not (IMO).
He made a clutch stop for about $20.00 or so, and it looks factory. He also offers a completed one for like $30.00, if you don't have access to a machine shop.
I had considered this, but I have not done it yet, and may not do it.
It can be a bit hairy on the road sometimes...