SWISCO - The Replacement Hardware Authority

Which Andersen balance do I need?

A contractor from Avon Lake, Oh says:
Anderson sash balance. See attached picture. Which balance do I need?
User submitted a photo of an Andersen window balance.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting. Check out our 24-939. This can replace Andersen balance boxes with the stamp 931.
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