Casey from SWISCO responded:
July 14, 2021
Hello, With this combination of attachments, you could have either an S380-22 or S385-22 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 use either the 2170 or 2175 strength options to support a 37-pound sash. 2170: 34 to 37 lbs 2175: 37 to 40 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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