Casey from SWISCO responded:
August 27, 2021
Hello, With this combination of attachments, you could have either an S380-31 or S385-31 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 3030 spring strength options for your replacement balances. These balances come with the spring, pulley, and end attachments. No assembly is required and these balances are ready for installation. 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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