Casey from SWISCO responded:
February 27, 2023
Hello, With this combination of attachments, you could have either the S380-35 or S385-35 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 3460 spring strength options to support a sash between 34-39 lbs. Thank you and let us know if you have any other questions or concerns. Comparison of the S380 and S385 balance shoes.
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