Duster Rear Window Louvers
It's just more practical. This is a close knit sites of fanatics of a certain type of car. We know what we want. And we get what we want. There's not enough of us to affect mass consumer markets, or else the new dart would be retro-styled :3
However, I think there's enough of a niche market that a craftsman here could carve him a nice little piece of pie, while doing something he loves, and supporting a hobby he enjoys.