The safest way to increase track, is to fit bolt on spacers. Spacers are sold in pairs. Fitment for the left and right of the vehicle.
Wheel spacers are used to widen the track of your car. This makes it more stable while cornering. It also allows you to fit wheels which perhaps do not have the ideal offset for your car. These can also allow you to clear the space you need to space your wheels out to clear those big calipers you have just fitted. Whatever the reason for widening the track of your car, even just to push the wheels out in the arches, it is important to get quality made spacers. Using spacers that will shorten your stud's effective length is dangerous. These KICS spacers are the best available on the market in Japan! Supplied in pairs, to fit your front axle, and rear axle as needed.