Tom from SWISCO responded:
November 7, 2017
Hi, John. Unfortunately, the code on the box is the only surefire way to replace the balance. If you give us the visible glass dimensions, we can very roughly estimate, but the code on the box is foolproof.
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Paul from SWISCO responded:
November 16, 2017
From your dimensions, it looks like you have a 3032 Andersen Narroline window that will take a 24-837 balance box.
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