double hung windows

A quick learner from scituate ri says:
i have a balance with a number of 11600-17 also a number H6 725 10 87, the window glass looking from the inside out measures 28 1/2" wide by 20" high. what would be the correct replacement balance spring for the window.

Tom W
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Paul from SWISCO responded:
Is this for an Andersen window? If so, I recommend our 24-737. This can replace Andersen balance boxes stamped with "725."
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