Lauren from SWISCO responded:
December 26, 2023
Hello, thank you for your patience! 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 will need a 21" balance with a 2040 stamp option. Please review and let me know if you have any additional questions. Comparison of the S380 and S385 balance shoes.
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