Casey from SWISCO responded:
September 3, 2020
Hello, With this combination of attachments, you could have either an S380-25 or S385-25 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 2410 spring strength options for your replacement balances as long as that option matches the stamp on your original balances metal channel. As for the compatibility of the top sash guide, as long as the balances you purchase are direct replacements for the originals, they should work with your existing guides without a problem. 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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