I found the thread where Hogwildz made his gasket. If you can't get a factory gasket, you can make one of these. You just need some 3/8" fiberglass rope gasket. Your stove shop will surely have that. He shows his gasket a little ways down this thread:
Did my cleaning this past Sunday. Even took off the surround, side grilles, top shelf & ash shelf. Painted the air fins on top black and the front inner corners of the casing black. Spent some time on her, now its humming along and I am enjoying. First off, about screened chimney caps. Here are...
www.hearth.com
Looking back through the thread, begreen mentioned that it sounds like air could be being drawn in somewhere. That makes sense. The draft goes up when the stove gets hot, and starts sucking in some air. Do you have access to an attic? Can you get up on a chair or ladder near the stove pipe to give it a listen? It would be good if you could try to pinpoint where the sound originates.
Close up pictures of where the stove pipe enters the chimney at the ceiling might help, too.
If it were in my house, I'd grab my mechanic's stethoscope. It has a metal probe that you touch to things to help you figure out where a sound comes from. If the town you mention is Whitehorse, Canadian Tire sells mechanics stethoscopes. It might help you figure out what is going on.
I know the Yukon is big so you could be a LONG ways from Whitehorse. I rode my motorcycle through it on my way to Inuvik. I figure there's at least a 50% chance you are close to Whitehorse since that one city has about half the population of the Yukon.