Check this out: http://www.hemmings.com/classifieds/carsforsale/dodge/dart?
I'm not sure if this link will work...but give it a try. There was an "anniversary gold" option for the interior, exterior, or both. But this is the best example that I've come across. Mine has the anniv. gold interior. I believe it was only available on GT's. Not positive on that though. Other than that and the horn cap it was standard GT trim as far as I know...
I just tried the link and it works...when you get to the page click on 1964....