Just measured the opening in my 65 Barracuda - it's right at 3 & 1/2 to 3 & 9/16 inches. Confirmed the same measurements in my 65 Signet convert. Hope this helps.
The outside dim on this is 3-1/8". Now assuming that the filler neck didnt change much, because the gas pump nozzle sizes have stayed the same. I "think" it should fit.
If you get me the measurements for:
Depth below the quarter panel surface.
Outside Diameter of the filler neck.
Oh try to get a little tighter measurement if you can. 1/16" is a big difference in a case like this.
Thx
I should be able to tell you whether or not it will fit.
It will be nice to know for the future anyhow.:-D