Block and tackle window balance

A home owner from Madison, WI says:
April 10, 2023
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 from SWISCO responded:
April 11, 2023

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.
20" Series 770 Balance
20" Series 770 Balance
S770-20
$12.00
How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
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