Nope. The '65 has the small diameter fill tube, they increased the size in '67. The cap you need is for '66 and earlier A bodies.
Member @damraider makes nice CNC ones for early As.
That's the cap I have, very nice piece. If I had to do it again, I'd put an aircraft/boat style cap next to the back window. Like this: Sea-Dog Line 351100 | Fisheries Supply