For those of you who want to know if they can put S197 wheels on their SN95, the short and sweet answer is "yes." Almost all Fords with 5-lugs have the same 5x4.5 (with the exception of MN12 chassised cars), so they will almost always "bolt-on" if the correct spacers are used. However, there will be rubbing issues if you plan on just bolting them on and driving into the sunset. The most complete kit that I have found to have them truly be "bolt-on" is this kit sold by New Take-Off.

I am not in any way affiliated with said website, but that kit provides longer studs and 13mm (.525 inch) spacers in order to provide appropriate backspacing needed on the SN95 Mustangs.

I have heard that if you want "the look" more than simply to get rid of the spacing issues that 1 inch is what should be used, however I know that those spacers provide the correct amount of backspacing required, and going to spacers larger than that should be hubcentric.

-

In my very humble opinion, it is not worth it to use 2005+ wheels on your SN95 unless you get them for extremely cheap, since these spacers alone cost half of what almost any OEM wheels go for used. My advice would be to try to find a deal on SN95 specific wheels, and go from there rather than trying to make due with something that wasn't designed for our cars.