Wheel fitment question

I have a 1994 850 Turbo Wagon, and have a real good line on some 18 inch wheels for it. They are blanks, so I can have them drilled out to our not so common bolt pattern. First question is, what is the hub bore on these cars? Second question, I have never seen anyone run a 9" wide wheel on these cars, has it been done? Can it be done? I plan on running a 225/40/18 all around. Is this going to work? I guess that it more than 2 questions, just looking for some clarification before I pull the trigger.