Block and tackle window balance

Home Owner from Madison, WI
Has 20B ESI stamped on one end. 20" long. The attached pics are from the good one but the other is trashed. Please advise on part no. I need to order.
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Jasmine
Jasmine from SWISCO
SWISCO
Expert

Thanks for reaching out! Your channel balances appear to be the S770-20 Channel balance. You'll need to select the 20E stamp. Let me know if you have any questions.

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