Replacement for E49 9#3128 Anderson balance

A quick learner from Chesterfield, MO says:
My balance numbers are E49 9#3128, there is also 11600-2. Whats my replacement?
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Donna from SWISCO responded:
Good morning, and thank you for posting! Please take a look at our 24-939 Andersen sash balance. This can be used to replace balance boxes with the stamp 9#31.
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