At Roaring Forties we have been working on a remote control electric rear view mirror. It will be the same as the mirror we currently use ( see web site for photographs ) which is an aluminium casting. I chose this type of mirror housing so that brackets for exactly this could be welded into them. It was requested by John Schnider who frequents this forum and it should be finished in a month or so. As a side , our wiring looms are already fitted for electric mirrors.
The RX7 mirrors do work well as one of my customers has already fitted them and I have driven the car. They are large and in my opinion too large.
Best wishes,
Robert