They all came from the same family dealership, Knoblock Bros., Inc in NJ. They were a Dodge, Studebaker and Mercedes-Benz dealership.
I don't know about the dealers installing the mirrors, as I was there at the dealership when our first one 63R 1086 R2 came in on the truck. The mirrors were on the car. I can't imagine dealers installing them. They mount into well nuts with 3/8" holes. Who in their right mind would want to drill holes that big in someone's new car.
It was my mother's Christmas present. I had no idea what it was when we went to the dealer on Christmas eve. But I sure loved when mom dropped me off at school and all of my friends were there. I remember always saying, light them up when she took off.
Another thing weird about that car was it came with Stainless steel wire wheels. Years later, I was talking to the parts guy out at the old factory, can't remember his name, but he was there forever. Super nice guy, he would talk to me for hours. I mentioned that one of the knock offs had gotten damaged and wanted to know about getting a replacement. I remember like it was yesterday, He said, so that's where the other set of those went. He said they were prototypes, but they were too expensive to make.'