I've got the 06 GT 17" wheels on my 88 and had them on the back of my 97 GT for a little while. Sorry, I didn't take any pictures of that, however I'm sure it would look sharp.
The bigger issue is that the offset is different on the 05+ wheels. They will be significantly tucked in. When I put the 06 GT wheels on the back of my 97, they were rediculously tucked in, even with a 1/4" wheel spacer. We are talking about at least 1" of difference in offset. On the front, I'm sure they would interfer with the strut and could not be run at all. You could run 1"+ spacer plates to offset the wheels, but we all know that isn't the best idea. I would highly recommend not trying to run them on a 94-04.