Actually they were sold here from '46 to '68. Here's a link to a site I found on them.
http://www.mercurypickup.com/I'm not shure how much of the info is accurate,, I see a chart comparing Canadian made GM and Ford/Mercury products to thier US counterparts on there that's about as accurate as a busted clock.,, unless you believe ChevyIIs/Novas were made in '53. LOL

BTW, one of my uncles has a '59 Mercury pickup project for sale.