Can you assist me with identifying my part number

A home owner from USA says:

Can you assist me with identifying my part number:

Window spring on the left side
26 4 FX CMC 11
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting. It's hard to tell what Series you need as you only show a picture of the bottom attachment. That said, I suspect you may have our S385-27. Just make sure that both the top and bottom nylon attachments have the same measurements as your own!
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