Andersen Window Balances

A home owner from USA says:
Need to replace two Andersen window balances for double hung window.

Markings on pull side are: 11600-2 and 171 5#23 9 81
Markings on opposite side are 11600-3 with US Patent numbers.

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Tom from SWISCO responded:
Check out our 24-531. This can replace balance boxes with the stamp 5#23.
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