remote mirror control passenger side

I am working on a 1970 R/T. The former owner replaced the dashpanel, but he didn´t finish the dashboard. There is a lot of work and some unanswerded questions left behind. The car has a remote controlled mirror on the passenger side. The cable and adjustment unit are just hanging under the dashboard. I can´t find any pictures where it should be installed, where the correct place for that unit is. Maybe on the left side of the steering column, there is a hole that could be the place, but I am not sure at all.
Does anybody know or has a picture that shows where to install that remote unit?
Thank you all.
Greetings from the german Motor City.
Author: joehiggins