Casey from SWISCO responded:
June 17, 2020
With this combination of winged attachments, you could have either an S380-15 or S385-15 channel balance. You 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 1440 spring strength options for your replacement balances. 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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