double hung window channel balance

A home owner from 10920 says:

I have a broken channel balance that i want to replace, here are some pictures of the defective balance along with stamped numbers. The plastic inserts are still in the window side and in good shape.
21 in length
1/2 in width l
Thumbnail of the uploaded file named IMG_20220625_133416108.jpg
Thumbnail of the uploaded file named IMG_20220625_133107043.jpg
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Casey from SWISCO responded:


Take a look and compare the S765-21 channel balance with a 20-3 strength option to your assembly. Thanks for posting! 

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