Lauren from SWISCO responded:
March 8, 2023
Hello, thank you for posting, With this combination of attachments, you could have either a 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. The length of the metal channel excluding the nylon attachments should measure 27" and you will need a 2640 stamp option. Please review and let us know if you have any additional questions. Comparison of the S380 and S385 balance shoes.
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