9" wide wheels on the front,.. even though they do work. Will rub when driven hard. And thats using 245/45R17 tires on them. 275/40 wont work. Rubs too much. Personally I would stick with 8" wide on the front.

10.5 with a 315/35 17 fits on the back,.. but may have issues with the quad shocks with some tires and some rubbing on the fender lip if not rolled.

6.5 is the back space for a 10.5" wheel.
Someone correct me if I'm wrong,.. but I think 5.9 is the back space for 9" wheel. And 5.5 is the back space for a 8" wheel.

Hurst