I'm looking at putting the 17 x 9 steelies wheel vintiques makes on my 68 fastback. Wheels have a 4.5" back space. I was originally thinking 245/45 or 255/45 but then started thinking more and a 275/40 is the same height as a 245/45 and still falls in the 9 inch wide wheel width recommendation. Anyone know if the 275/40 will fit on the rear using the specified wheel width and backspace? Will it work on the front? I've got an old 245/45 tire laying around that I'm going to try using for a little measuring to see what I think but anything I can get from someone with experience would definitely be appreciated. Even someone saying they are running 255's and what clearance they do or do not have left is helpful.