They're built-in, use CMP and do a search for Kuid:-1:7804, that's the United States Region, kuid:-1:7803 is United Kingdom, kuid:-1:7801 is Australia. Clone the region with the properties you want, cars on left, cars on right, then edit the car part of the config file changing to the cars you want. Change the name to something like MyRegion and note the kuid. Open your route config and change the region tag to the kuid of your region.
Norm