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Try here http://www.skinnersights.com/index.html
Andy ships to Canada.I just got one last month for a Stevens crack shot.Your rear sight is only a standard dovetail isn't it?Its likely 3/8" which is easy.Or is it grooved also?
I use the Grooved 22 Peep Sight from New England Custom Guns. Works great and is very rugged. I put a Williams FireSight on a ramp on the front and find it is very accurate.