Lauren from SWISCO responded:
September 7, 2023
Hello, thank you for posting, 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. The length of the metal channel excluding the nylon attachments should measure 17" long and you will need a 1630 stamp. Please review and let us know if you have any additional questions. Comparison of the S380 and S385 balance shoes.
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