Since we know a 17x11 wheel w/6.25" backspace will fit a 68-72,a 17x10 wheel with 6" backspace might work with that size tire. A 325/45/17 will have shorter,stiffer sidewalls than a 325/50/15 and we know how snug the latter tires can be to fit. My guess is the 17" tire will be an easier fit.