Non Tilt Window Balance

A home owner from Miamisburg, Ohio says:
July 30, 2021
Part I need says 2640 on it. I have several windows that need new window balance but I wanted to try one first to make sure I can fix. Can you help me identify what I need by looking at the picture?
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Bob from SWISCO responded:
August 4, 2021

I believe this is either an S380-27 or S385-27. The only difference between these two balances is the depth of the bottom nylon shoe as pictured below. Compare both with your old hardware to see what matches best. For a new stamp option choose 2640.

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
27" Series 380 Channel Balance
27" Series 380 Channel Balance
S380-27
$10.55
27" Series 385 Channel Balance
27" Series 385 Channel Balance
S385-27
$10.55
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