I don't profess to have seen every car produced in those years. Just trying to help the seller since what he has is kinda rare.
What I know is that I have one on my 66 Valiant and my friend has one on his 66 Coronet. I had searched for one on here and the rest of the net for one for about 4 years but everyone I contacted told me it was a one year only thing. They will fit right or left hand side and I wanted a second one for the passenger side. Also, if you Google images of these years cars, you won't find that mirror on anything but a 66.
They do repop these but they are stupid expensive.
Oh, BTW, I did find one about a year ago.