Casey from SWISCO responded:
August 25, 2021
Hello, With this combination of attachments, you could have either an S380-21 or S385-21 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 2040 spring strength options for your replacement balances. Also, your stamp indicates that you should have a 21" metal channel, not including the end attachments. You may want to double-check your measurement to make sure that this is correct. Thank you! 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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