I recently purchased my 1988 GT and was given a set of weld wheels for it from the seller. The wheels he gave me for the rear are 15x10 with an offset of 25, so I believe from research that comes to a 6.48 inch back space, and from what I read the cars use a 6.5 inch back space. The car has the rear end from a 95 mustang installed, so its 5 lug and disc brake. I would like to put these wheels on the car, since the matching front wheels are already on, but they are not 15x10, look more like 15x8. So my question is, will these 15x10 offset 25 rims fit the rear of my car without modification, and what size tires should I put on? I will not be drag racing or anything like that, just driving it to work and for fun. Thanks in advance for your help.