Mirrors come with the wires for the power glass and turn signals. We cut the wires off for the heated glass. It’s highly unlikely that a show car is going to be kept outside where the mirrors will be covered with ice.
Customers have been using Ford Focus switches.
I have never used my power glass. I adjusted the glass when I installed the mirrors two years ago, and I’ve never touched it again.
The drivers side visibility is great, and the passenger side is not, but it’s better than what Camaro’s came with. Nobody buys the mirrors for their functionality.
A 67 Camaro will need to have the vent glass raised a couple of inches so the metal on the inside of the door can be trimmed. It needs to be trimmed so you can access the studs with a socket wrench. Then the vent glass goes back into place. I had to do this on my 67 Camaro.