Just to get a reference of what I can do, the male plug on one's block heater itself (not the cord), is it a two-pronged square, or two pronged round plug?

I had a round one for my Euro-spec engine, but now have an American market engine with a square male plug, so my cord doesn't work. What can I do?

Would something like this work OK?

http://www.canadiantire.ca/AST/browse/3/HouseHome/2/Electrical/IndoorPowerCords/PRD~0522207P/Mini%252BAppliance%252BCord.jsp