66 Dart driver's side mirror not same as 67 up?

I have a couple remote style driver's side mirrors off a 66 Dart. I thought I could use one on my 67 Barracuda, but the base won't fit. Is the 66 a one year thing? Or is the Barracuda different? I'd like to find a remote style mirror for my car, but need to make sure it will fit.

Thanks.