Window balance

A quick learner from Seattle says:
Unknown window.
No markings on window
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Emily from SWISCO responded:

Hello!

With this combination of attachments, you could have either an S380-13 or S385-13 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 will also need a 1240 stamp option.

Let me know if you have any questions!

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
A quick learner from Seattle says:
Perfect,
thank you!
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