Window bal replacement

A quick learner from Waikoloa Hi says:
Don't know which option to select
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Emily from SWISCO responded:

Hello!

With this combination of attachments, you could have either an S380-27 or S385-27 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 the 2640 stamp option.

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