1970 Duster remote mirror

Looks like my car came with dual mirrors or some one put one on the passenger side, I am not sure which, and I did not get the mirrors with the car when I bought it so I am not sure what style they were either. my question is if I buy the round type mirror with remote what do I have to do to mount the cable to door or panel? I am not sure where the cable goes! do I have to buy a new door panel with hole in it already or can I use the panel I have if it goes in panel?

DSC00288.JPG

DSC00289.JPG

DSC00290.JPG

DSC00291.JPG