The early 4 lugs on the Falcons, Comet, Mustangs, and Mavericks used a 4 x 4.5 inch bolt circle. The Pinto, Mustang II, later model Mustangs (Fox chassis) and other newer model Fords used a 4 x 4.25 inch bolt circle. To figure out back spacing and to get into the ballpark take one of your rims and lay a straight edge across back side and measure to were the wheel face bolts on than do the same for the wheel you are looking at if they are close it could fit but also check dia. and width measurements to see if will fit into the wheel wells and clear steering parts. For a simple test you could cut a piece of plywood to the wheels dia and drill holes to be able to mount it. Than bolt to front hub and turn the wheels through the turning circle to see if it would hit anything than try it on the rear usually there is much more room on rear to fit a bigger dia. than on the front.