Does anyone know if gt500 shocks/struts will fit our cars?
I'm going to guess no as GT500s (and '05 and up Mustangs) are not Fox bodies.
By looks alone...no.
http://www.americanmuscle.com/frpp-handlingkit-0712gt500.html
The shocks you could probably get 'em to work by fabbing up a bracket, I'm sure they're different length than our shocks.
No. Not No, I don't know, but No, it won't work.
Our cars use modified McPherson struts of a certain shape, and the GT500 uses standard type McPherson struts. So to make it work, you'd have to install a new larger strut tower, a different steering knuckle, different control arms, and probably inner and outer tie rods. And all that is assuming you have an engineering level understanding of suspension geometry and welding/fabrication. Do yourself a favor and browse over to maximum motorsports, get 87-93 mustang parts.
You're probably right I just saw a set on Ebay http://www.ebay.com/itm/221160052726?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649 and I thought hmmm maybe lol.
Although other than the strut tower and the spindle I don't see what else needs to be modified.