This specific model of Patrol was chosen by the United Nations when it came out because they consider it the "most reliable" of all vehicles available. You could still see a few of them in missions in Irak and other parts, but specially were popular during the first Gulf War.
Maybe you can contact Nissan in Panama for parts. That will be the closest one. They brought the diesel engine model one. Also Ecuador in South America, with the gasoline engine version (4.2L), although getting parts from there to Canada can be a real task.
One fact that is little known about this model, is that the Reverse gear is fitted with a synchromesh, that really comes out handy when your stuck, to work rapidly back and forth to free the vehicle.
Esteban