10#31 andersen balances

A quick learner from st louis mo says:
my stamping is 10#31 5-87 also says 11600-17 which balance do i need john
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Tom from SWISCO responded:
Good morning, and thank you for posting. Please see our 24-1033 Andersen Sash Balance, which can be used to replace balance boxes with the stamp 10#31.
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