Casey from SWISCO responded:
August 15, 2023
Hello, With this combination of attachments, you could have either the S380 or S385 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 1740 spring strength options for your 18" replacement balances and 1220 for the shorter 13" balances based on your stamp codes. 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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