Harold....BMW arm had a ball in socket type fitting on the end which I removed. I drilled a hole in the end of the arm, and used a long stainless steel cap screw which threaded into the holes in the divider bar. Mirror was from an older ( mid 90's ) 735 so it didn't have all the bells and whistles the new ones have ( compass / auto dimming )


1940 Chevy KC 1/2-Ton
In the Stovebolt Gallery