I posted up my Supersprint header, 4 speed, clutch, alternator, and my 16" Porsche Fuchs (which fit with H&R adapters.

http://motors.search.ebay.com/_W0QQsassZgreggearhead

Got any pics of what these look like on the BMW?

I do not, but I did check on adapters and they can make them to the exact offset we need for an E21 for about $260.