Casey from SWISCO responded:
December 3, 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 2920 spring strength options for your replacement balances. As for your top sash guides, take a look and compare the 18-178 pair to an undamaged part. 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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