Ditto. I bought my '97 854R with the turbos on it, although the tires were not correct in size and rubbed. You have to be careful there because the 850R is set up with little room to move. I'm going to have to replace my wheel well liner because I drove it so much with the larger tires that it rubbed through.
I've also been told the 15" wheels with snowtires will fit. I'm about to pick up a set from Annapolis Volvo in MD and they've told me it shouldn't be a problem.