As to the center hole of OEM Ford wheels, back in the earlier Crown Vic days, they had a nice factory wheel that looked like the old "wire mags" of the 1970s. They ALSO were used on the CVs BEFORE they went to the "front hub" bearing assembly, rather than the prior "wheel bearing" rotors they used. In one of the older C-body forums, a poster detailed how he made the OEM Ford wheels fit his Cordoba. Had to chuck the wheels into a lathe and machine the center hole larger (to the Chrysler diameter), after which the Ford wheels fit perfectly. Was NOT a lot, but enough to keep the Ford wheels from being "flat" to the mounting surface on the rotors and such.
Yes, Ford bolt patterns have been 5x4.5 back into the 1950s, but it's that center hole diameter that will be the issue rather than anything else, in OEM wheels. In aftermarket wheels, many list the "center hole" diameter in their specs. No mention of "Ford only", though.
The reason the center hole diameter is important, plus "wheel centering rings", is such that THAT hole is a locating device for the wheel, such that the lug nut studs are not the ONLY thing centering and holding the wheel securely to the rotor/brake drum on the car.
This cneter diameter also comes into play on the rear wheels, too. The round "lip" on the axle shafts do the same thing as the center hole diameter on the front wheels. A similar locating device hiding in plain sight.
On the factory 1970s Chevy Camaro Z/28 wheels, there are three little nubs near the top of the center inside of the raised center of the wheel (where the center cap snaps in). For locating purposes against the wheel hub. But on the back, everything's located purely by the lug nuts, on those wheels.
As to backspacing . . . that will depend upon if the Mustang uses a unified hub bearing mechanism or the old separate wheel bearings adjusted with a nut on the end of the spindle (as your Fury does. More backspacing on the later-model unified bearing assy. If the backspacing might be more than about 4-4.25" (measured by the CORRECT way to measure backspacing!!), the wheels will not fit correctly, being too far inward.
The wheels look good. Seems like somebody is doing them "aftermarket knockoffs"? Which might be what is needed, designed for the older style front wheel bearings.
As to other Ford factory wheels, if the spokes/wheel covers have NO recess from the outer bead area, they are for the "front hub" cars. Like a front-wheel drive car, basically. So the ones with the outer area recessed, as the old wire mags wheels were, are the "traditional" front wheel bearing vehicles, whose wheels need the center hole machined larger for use on Chrysler vehicles.
Take care,
CBODY67