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Hi Scarecrow,
It depends on where you live. In Australia I get that spring (No#181) at Bunnings. You'll also find that spring (#651) in most hardware stores in North America. Outside of that you'll need to take the specs from the spring and match it up with a local supplier of springs. It's a very common spring so you'll definitely find something close nearby. If you do find a substitute locally then please post the link here so others can benefit?