Jeff,
I agree with VR. Chris at SJ BMW has been making and machining performance parts for BMWs for a long time. He most likely has most of your answers, if not the parts you need. There is a link you've probably found already in the
www.sjbmw.com site under 'parts', ccproducts. I think this is Chris's machine work operation. Years ago I think it was a standalone company and there was a full catalog of parts.
see ya later,