Emily from SWISCO responded:
January 24, 2022
Hi there! With this combination of attachments, you could have either an S380-15 or S385-15 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 1450 spring strength option, which supports a sash weighing 13 to 17 lbs. Comparison of the S380 and S385 balance shoes.
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