Pay the extra $100 to get the right size. Don't cheap out and get the wrong size...why?

They'll look funny, they'll look too small, increase the wheel gap.

They'll change the gearing, you'll be putting on more miles on the odometer than you actually are going and the speedometer will be indicating a higher speed than you are actually going.

Much less protection for the wheels, making it easier to bend or crack a wheel on potholes, etc.