you did a good job with this website! and a beautiful car with an interesting history.
Only one link to the BMW CS Coupé site, German, incl. an active forum
was markd by my Antivirus as malware site.
My 2000 C Automatic is a Dec.1967 Car, bought by my gandpa, and living in our famliy since 1967. 60000km original, one time restored bodywork and paint. Dashbord etc all original. Engine overhauled 2013, automatic gearbox in 2015. There I got a good specialist for oldtimer automatic transmissions, Automaten Mayer at Luzern,Switzerland. He also has no problems with parts, because a big stock and good know how where to get and some production tools to make every part, what is needed. http://www.automaten-meyer.ch/de/
They see a transmission as a clockwork. Not cheap, but perfect work.
I have seen, I already was registered in this forum- so I think you made your side new?