Early Dart companion mirror location

Thanks for that info Mark. I didn't pay attention to the vent window operation when my son helped me find a home for it. If I in stall it a inch or two back from the drivers mirror, I can see most of the mirror looking around or through the vent frame and it looks pretty good compared to the drivers mirror. I wondered if there was a more specific measurement. I will have to look in the service manual to see if there are measurements. Mike