Hi Dean, I went with Anderson 50ST winches for the replacement primaries on my C&C 34. I like the size which is physically similar in diameter to the original Barients and they make winching in the genoa a lot easier than the old tired non-self-tailing Barients. I don't remember how the sizing compares to the Lewmars but you can compare the specs. I would probably go with the higher end Lewmars if I was to do it again, but the Anderson's are fine. Note, the bolt pattern was not the same as the Barrient and I filled and glassed in the old holes and redrilled to install the new winch / it was part of a bigger refit fixing lots of holes and repainting the entire deck so that wasn't a big issue for me.
Not sure regarding Canadian sources. I ordered mine from Defender and they shipped directly from the factory in 2020 - I believe Defender does ship to Canada if you want. Nathan Post S.V. Wisper 1981 C&C 34 CB Lynn MA USA