These wheels will fit with the backspacing/offset, but here's the first thing to concider on a stock 4-lug Stang:
The distance from the 'wheel mounting surface' (brake rotor/drum) to the fender lip is 1" further on the rear compared to the front (4-1/4" vs 3-1/4").
So by retaining the stock track and buying these wheels (which all 4 have the same offset) you will have a situation where the rears will tuck inside the wheelwell about 1/2" and the fronts will stick outside the wheelwell about 1/4 to 1/2".
The visual appearance of the car will look okay from the side, but when looking along the body lines you will notice the tuck-untucked look of the wheels ... ugly.
The solution would be to buy spacers for the rear and then longer studs for the axles to band-aid widen the rear track.
I personally don't care for running a wheel larger than about 8" wide on the front of a Stang, as the car doesn't track as well and can be quite annoying
Also, when people buy the M2300K ford 5-lug Cobra kit, it comes with axles that widen the track 3/4" per side ... finding good 94-95 Stang parts works as well to widen the track and obtain a 5-lug setup.
I don't know, it's your car though.