Casey from SWISCO responded:
January 27, 2021
Hello, With this combination of attachments, you could have either an S380-30 or S385-30 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. Your balance stamp indicates that you may need 2965 spring strength options for your replacement balances to support a 35 to 39 lbs sash but you may want to weigh your sash to confirm. There is a chart on the product page that explains how to choose your option based on the sash weight. 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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