Channel Balance ID

A home owner from Shoshone, ID says:
Looking for spring parts. Can you help us? We bought a spring from local store, it didn't work right. It is a small window 22-23" by 3 feet.
Thumbnail of the uploaded file named 20190307_131024.jpg
Thumbnail of the uploaded file named 20190307_131010.jpg
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Casey from SWISCO responded:

Thanks for sending in your balance photo. It looks like you have either our S380-12" or S385-12" channel balance. The difference between the two lies in the shoe. The series 380 balance has a 1" deep shoe while the series 385 has a shoe that is 1-3/32" deep. Compare your shoes to this photo to decide which is the better replacement. Then select spring strength option 1120.

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
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