2040 balance replacement

A professional from USA says:
2040 is stamped on the side. The metal u channel is 22 in long. Please help thanks
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
I recommend looking at our S390-21 balance first. This comes with our 15-001 bottom and 19-002 top pre-attached. Do these attachments match yours? I recommend comparing your measurements to ours to confirm. If they're the same, the S390-21 is the way to go!
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