Casey from SWISCO responded:
January 13, 2021
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'll also need 2640 spring strength options for the balances in your smaller window and 2665 options for your replacement balances in the larger window. to weigh your sash to determine which option you'll need. 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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