A member here, CapriRacer, publishes a site called
Barry's Tire Tech and he specifically addresses 16.5" wheels. You'll find it on his home page, just scroll down and click it.
What's already said above is true and Barry's site bears it out. You've done the hard part finding the wheels. Just pick a size and go. Just be sure you have verified the Dual Wheel Offset of your replacement wheels.
As an added bonus, the 215/85R16 and the 225/75R16 have the same load ratings. The 225 is more of a "standard Class C tire" but some prefer the 215 for a little more height and a little more space between sidewalls. When mounted on wheels with the same offset, that is.