Casey from SWISCO responded:
July 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 to locate the stamp printed on your metal channel to choose the corresponding strength option. 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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