I read all the old post before I wrote this. I'm looking for a pop-up style gas cap like ones used on some 6o's Mustangs that also fit my 73 Maverick. My impression from reading old post is that some do fit without modification but the diameter may not have the visual appeal I'm looking for. Aside from Mustang does anyone know of anything that has a slightly smaller diameter that fits without to much modification? I looked around for aftermarket custom caps for Mavericks but couldn't find anything.