These are 18X8 with 235/40R18 and have plenty of clearence all the way to the bumpstops. This is both wider and taller than stock in the tire. The rim IIRC is a +48 offset and looks like you could make it work with a 40 offset if you were conservative on tire selection as I tried a 8mm spacer in the front briefly. This is why the older mustang rims fit decent.
The current Mustang GT seems to have switched to a deeper offset so these rims should be even better. Just have to watch as they have some seriously wide versions.