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There are basically (2) manufacturers of conversions cylinders in USA Kirst Konverters and Howell Arms. I have purchased from both using an importer to bring them into Canada as parts as I found Canadian distributors rarely carry stock and when they do they are expensive. You might want to compare your options.
45C is correct, have the US vendor ship to an importer US location, in my case Borderview and they will handle from there - you need to coordinate with the importer.