The vehicle can be found in Westlake, the Warehouse District and Boyle Heights. It can also be found during the Arson street crime case Hot Property. The suspect will crash into a KB8 at the end of the car chase. However, do not go in this KB8. There should be another one to your left as you drive down the street.
A unique model of International KB8, the Polar Bear Ice Truck version, can be found in the parking lot of the Polar Bear Ice Company at the corner of Hawthorn Ave. and La Brea Ave. in Hollywood, on the western edge of the map. The Polar Bear Ice Truck International KB8 counts as a separate vehicle. Make sure you're looking for the right one. The first service vehicle, the Polar Bear freezer truck, is the International KB8 while the 18th vehicle in the showroom is the International KB8-Closed.