Casey from SWISCO responded:
April 14, 2021
Hello, With this combination of attachments, you could have either an S380-30 or S385-30 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 2930 spring strength options for your replacement balances. As for the top sash guide, take a look and compare our 18-161 to yours. 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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