See this thread for contact info, and confirmation that Sym Canada is currently filling in while Carter Bros. rebuild:
http://symforum.com/index.php?topic=655.0Based on my dealer's experience with Sym Canada (I'm in London, Ontario), I can confirm that they seem to be on the ball when it comes to OEM parts availability.
However, I suspect that they may not have access to the accessories that Carter was producing locally in the States. For example, the Canadian website shows a tubular rack for the Citycom, and not the laser-cut one that Carter was offering. There aren't as many windshield options, either:
http://www.symcanada.ca/accessories.php