* Your vehicle's paperwork: The owner's manual or any paperwork that came with the car should specify the original tire and wheel size.
* The tire sidewall: Even if your tires are slashed, the sidewall might still show the size (e.g., 225/60R16 or 225/55R17). The numbers before "R" indicate the tire width, and the number after "R" indicates the wheel diameter in inches.
* The wheel itself: Look at the wheel; it should have a size stamped on it (though this might be difficult to read if the tires are still on).
* Your vehicle's VIN: A parts store or mechanic can use your VIN to look up the factory specifications for your car.
Once you know the original wheel size (16" or 17"), you can look for used replacement wheels of the *same* size and bolt pattern. Using a different size wheel could affect your speedometer, handling, and potentially damage your car's suspension or other components. The bolt pattern is crucial; it's the number of lug nuts and their arrangement on the wheel. Again, your owner's manual or a parts store can help you determine your car's bolt pattern.
Caution: Don't just buy any 16" or 17" wheel. Make absolutely sure the bolt pattern matches your Aurora's. A mismatch is dangerous and can lead to wheel failure.
