Need replacement sash balance

A quick learner from Maryland says:
Part number:

BJ15 527 4-88

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Emily from SWISCO responded:

Thank you for reaching out to us. Based on the 527 I see here, the 24-531 would be my pick. This is meant to replace balances that include such a stamp. Take a look and see what you think. 

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How to replace an Andersen Window Balance
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