Window sash balance S385 or S380

A quick learner from 85338 says:
Attached pictures metal length is 26". It appears to be a S385 or S380 not sure which but I would need 2 at 26".
Thumbnail of the uploaded file named sash depth.jpg
Thumbnail of the uploaded file named Sash end.jpg
Thumbnail of the uploaded file named Window balance ID.jpg
Thumbnail of the uploaded file named sash width.jpg
Thumbnail of the uploaded file named sash end cap.jpg
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Casey from SWISCO responded:

Hello,

With this combination of attachments, you could have either the S380-26 or S385-26 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. 

You'll also need 2540 spring strength options for your replacement balances. Thank you and let us know if you have any other questions or concerns.

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

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