SWISCO - The Replacement Hardware Authority

What is replacement for this sash balance

A home owner from ohio says:
The number I pulled from the old sash balance is
G312 31 174

Whats the replacement for this one?

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Paul from SWISCO responded:
Hello! Based on your stamp, I recommend our 24-1231 Andersen sash balance. This can replace balance boxes marked with "12 31."
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