Rarest A-Body Option?

OK, it's time for someone (more qualified than me) to make a list of factory options vs. dealer add ons or packages and see where we are with this.
As for the painted roof, I think it was an option. Seems I've seen one myself and MCG or someone had an article on a Duster like this a year or so ago.
I've seen a silver vinyl top 67 Dart GT, supposedly a rare color.