I got my new window switch and fan clutch from BMA and replaced them in my E30. The switch was terribly easy, just pry it out with a screwdriver. I decided to put the new switch in the driver's front window position as this is the one that gets the most use.
Also, the fan clutch, not as easy a job as my 535i was. Very tight quarters on the E30 and the reverse thread nut was on pretty tight. Using my 32mm open ended bike wrench I had to pry the belt up with a crow bar to tighten it up. Finally is loosened up after wacking the wrench with a regular hammer. I then also had to unlatch part of the fan shroud to get the thing out. Not too bad from there, just replace everything in reverse order.