Casey from SWISCO responded:
April 16, 2021
With this combination of attachments, you could have either an 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 2540 spring strength options for your 26" replacement balances and 2840 for the 29" 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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