Just FYI 64 and 65 seats I believe are the same but 1966 are different yet again. I have a 65 interior which I thought would be the same as my sons 66 and we were wrong. If I remember correctly the 64/65 seat is slightly wider than the 66. I do know for sure they didn’t fit, and they are still sitting in my basement. I would be glad to give them to you but I am located in Ontario Canada. Cheers.
