In a cursory search it looks like they start going concave around 9 to 9.5 inches wide with appropriate offsets. In the wheel thread someone posted 18x9.5 that looked perfect on an alltrac. You'll have to search the thread for effective offsets. I think your biggest problem is going to be finding the NT03+M with a 5x100 bolt pattern at the offsets you're looking for. But good luck. Post up if you find a fitment that works.
