Winter wheels for 2011 S80?

[sbart]

Hello,
I would like to get some winter wheels for my Mom's 2011 S80 3.2 (front wheel drive). Does anyone know which Volvo wheels from other models/years will fit? I would like to get as small a diameter wheel as possible and as narrow as possible to improve snow traction. It would also be good to have the Tire Pressure Monitoring System sensors in the wheels. Please let me know the wheel size options if you know them. I would rather not find out the hard way that a certain size won't clear the brakes, for example. I would like to stick with the specified offset.

Thanks!
Steve