Casey from SWISCO responded:
April 13, 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. I can't make out the stamp code on your balance channel but you can check the balance on the other side of the window to determine the correct strength option for your new balances. 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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