Originally Posted by Spud100
...Don't fear spacers. The won't work loose as some claim if you torque them correctly.
To clarify, buy good spacers. AlloyUSA and Spidertrax make spacers built like wheel adapters, you bolt the spacer to your rotor, then the wheel mounts to the spacer. Do not buy those little shims that are just wedged between the two.
I would do all 4 wheels. It will look funny with one set sticking out more. You also have to consider the rear wheel well is slim so you may have a spring perch or such to watch for.