Ask and you shall recieve! (Flip Top Gas cap Adapter)
If it can be made to work with the cap that says "FUEL" then put me on the list for your next run of adapters. I'm pretty sure it should work. I had a friend who took a "FUEL" cap off of a '69 Barracuda & put it on a '74 Challenger. But I think the original Challenger caps flip the opposite direction. Maybe an early Charger cap would be better. I think they said Fuel on them.