Is two tone paint (WJ2 - no vinyl top) uncommon - 1968 GTS 340

I know someone who has an original 1970 Barracuda, blue with white painted top, documented. They exist, and I would call them "rare", since hardly anyone has ever seen one. Not sure why they offered this option, but some have speculated that it was because certain buyers back in the day didn't like actual vinyl tops because they thought they would rust out, but liked the look.