I haven't ordered, but Century Spring Corp. is the only place in North America that I've come up with so far. Sucks having to convert everything to inches, but after searching their online catalog it looks like they carry springs that would work. Of course it would help to know what diameter wire or what the compression rate of the supplied springs would be. Also, I don't know if CenturySpring.com has a minimum order quantity or dollar amount to meet.
