I'd suggest pulling the entire sprinkler out and bringing it either to Eljay Irrigation or Regency Plumbing (South Calgary and North Calgary respectively) to see if they could sell you a replacement or possibly equivalent head.
If you can figure out what make it is, maybe it is something that you could call ahead about to ensure that they have in stock.
If you're new to this sort of thing (like me) bringing a few pictures with you probably help as well.
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