Can you fit the wheels from 98 cobra mustang to 94 mark viii?

No, you can't directly fit the wheels from a 1998 Cobra Mustang to a 1994 Mark VIII without significant modifications, if at all possible. The bolt patterns are different. The Mustang uses a 5x4.75" (5 lug, 4.75" bolt circle diameter) pattern, while the Mark VIII uses a 5x114.3mm (5 lug, 114.3mm bolt circle diameter) pattern. These are not compatible. Even if you could somehow adapt the bolt pattern (highly discouraged due to safety concerns), the wheel offsets and potentially the overall wheel diameter and width would likely be significantly different, causing clearance issues with suspension components, brakes, and fenders.