1965 Barracuda Formula S rear defroster
So the way I have seen them,
If it was non tach no a/c it was where the tach goes.
If it was tach it could be under radio
If it was tach a/c car it was under tach but out of way of e-brake
I would call Wildcat Autowrecking and see if they can help you.
The switch was the same from 64-66 same as convertible top in Valiants.