Dart GT side mirrors

The '66 and earlier remote mirrors used a larger diameter control than the '67 and newer version. If you're converting to remote from a manual mirror, use the '67-up version as it's much easier to find. The main advantage to the earlier remote mirror is the control head can be removed easily from the cables (which you have to do to install it in the door). The '67-up control is crimped tight around the cable housings and sometimes breaks if you try to remove it but it will slip through the hole in the door skin so removing it is not normally necessary unless you want to disassemble it for rechroming.
There are a variety of control knob shapes through the years also.