Those were used by many Canadian cities. Try calling some of the glass outfits in Vancouver, Edmonton, Calgary, Saskatoon, or winnepeg. Western Flyer was made in Winnepeg. You can try the factory. I called them for an airbag for mine. They have several warehouses of old parts they told me. Getting someone to go look is the problem.
Same as the US. The farther East you go, the less accommodating they are!