1970-72 Dart Gas Cap GY8

I'm using a '69 cap on a '73 car that I bought a few years back for $20 and it works like a dream.

Also, for what it's worth, the painted plate and pot metal handle come off of the type specific fixture.

So with that in mind you could get whatever year with the used gold paint and if you absolutely couldn't get the complete setup to work with any amount of tinkering, you could swap the guts for another. Maybe even an aftermarket if you could get the screw holes on the pot metal handle to line up with the holes in the fixture. The machine threads are in the handle, so it would just be a matter of checking and maybe cutting/ filing/ drilling corrected holes if need be.

Hope this helps.