Gas cap

I have a 69 Barracuda with what I believe is a 68 style gas cap on it. No fuel script. My car has an early buid date of 9/10, so I wonder if they would have been trying to use up some left over 68 parts? Thanks for any input.
Until you find an earlier '69 with a "FUEL" cap, I'd just use it if it's nice. Who's going to argue the point?