Okay, I have searched and searched and found help for w123 but NOT w126 specific help for Bosch Euro headlights.
I found a thread that reference this:
http://www.dieselbenz.info/prettier_headlights_install.htm
but this doesn't quite fit Coda's application. The tail light plug from a w126 does NOT fit. I know someone has done this before. Do I need a tail light plug from a w123?