5.5" back spacing on a 10inch rim is all wrong for a fox body. need a 6.5 bs rim on a 15x10. Will most likely rub very hard and stick out like a monster truck.
Yup....
You can get a 10" rim to fit on a stang but it takes some rolling and you will need the right wheel tire combo. Corral.net has a sweet wheel thread that has a hundred pages of wheel/tire photos along with what the backspacing was, tire size is, and if there was any additional work that needed to be done (rolling, remove quad shocks, change links, ect). Here is a link:
http://forums.corral.net/forums/wheels-tires/296569-foxbody-wheel-picture-thread.html