Look for industrial supply chains over there. Is there a Grainger there? McMaster? MSC? Those kinds of places will likely have them. If not, there's always ebay and Amazon.
First off, have you found this page? You can see the exploded views and parts list and everything else there. The parts list tells you what the bearing sizes are.
https://www.associatedelectrics.com/teamassociated/cars_and_trucks/NTC3/RTR/manuals_setups/
If you are referring to bearing 3976, it...