trying to locate unusual window balances

A home owner from Cincinnati Ohio says:
HI there, The house I have just bought dates back to 1891, possible older. I would like to replace the window balances, but the local window specialist here in Cincinnati has never seen this kind befoe. The rod itself is 31" long. Pretty sure the diameter is 5/8. I am hoping to find 10 of these.
Many thanks!
Thumbnail of the uploaded file named balance 2.jpg
Thumbnail of the uploaded file named balance 1.jpg
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Paul from SWISCO responded:

Thank you for sharing your photos with us. For the spiral balance I believe the Series 500 is a good match. You can use this balance with either the 17-007 or 17-012 brackets. Take a look and let us know if these are good substitutes for you.

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