I am wondering if someone can help me find the proper replacement gas cap for my vehicle. It is a 1975 F100, but does not have the original engine in it. I do not know if the tank has also been replaced/modified. The cap I previously ordered that said it fit my 1975 f100, did not. The existing cap is locking, vented, chrome or steel finish exposed cap that measures just under 4" in diameter. I've included pictures of existing cap (larger rusted one), as well as the one I was told was the replacement. I was unable to search the forum for a previous post because apparently "cap" is too common a word.
Bonus points if you can tell me the paint color, which is also not original, and not the same as identified by VIN