Andersen Sash Balance, BP7 12#27

A quick learner from Ocean City, NJ says:
I need to replace the sash balance in a window - the cords broke. The old sash balance has the following numbers on it: BP7 12#27. Can you tell me which part I need?

John S
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Donna from SWISCO responded:
Hi John,
The needed replacement balance is SWISCO product number 24-1231, Andersen Sash Balance.
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