Pretty much everything 94GT5.0 said but I have seem them on the corral.net classifieds. That is probably the biggest mustang classifieds on the internet.
Here is a set that was posted in October…just for an idea, they probably are gone now though. 93 OEM svt cobra wheels | Ford Mustang Forums
This is the wheels/tires part of the forum: Rims Wheels and Tires | Ford Mustang Forums