1966 Optional switches: Rear Air & Hazard flasher. (I need info)
I think both were optional accessories. The rear air defroster hardware in the rear will be hard to find; the switch not as hard and the wiring harness can be duplicated.
The hazard harness was constructed with 2 connectors so that the 1 connector plugged into the turn signal harness and the other to the dash harness with a separate wire to the flasher. The other wire from the flasher goes to the fuse block. If you have the connectors, the correct terminals and switch, the harness could be duplicated. I had a NOS assembky. But ended up selling it i made one for a 65 Coronet i had and it worked perfectly. I have everything to duplicate that harness and if I ever got off my lazy butt, I could do it;it’s just a real low priority right now