Go to one of those shoe bars you see in the big supermarkets and/or shopping centres. I once went to a locksmiths to have a key made from a barrel number but spare keys from a shoe bar key cutter shouldn't be a problem if you have the originals.
At worst buy a blank of ebay and bring to any locksmith (or key cutting shoe bar etc as said) as I doubt many places will still have them. I was able to get copies made and get a key cut for a bootlock that I hadn't a key for at a local locksmith a good few years ago. They'd been in business a long time though and still had old blanks!!
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