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The crappy tire by my place has a really bad selection as well. You could try Active Surplus (downtown Toronto, Queen, 1 or two blocks east of Spadina). Last time I was in there, they had several little bins of o-rings (thin, thick, square and round x-section). I was looking for something else, so I didn't notice what they has so far as smaller ones. You could call ahead with the dimensions, the guys there are usually busy, but helpful.
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