Sun Air window balance

A home owner from USA says:
Here is the part we need to fix our window. It measures 23inches.

Please let me know if you need more info.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Check out our S350-21 channel balance and see how well this matches your hardware. Keep in mind that length is based only on the metal channel; you do not include the nylon attachments.
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