Casey from SWISCO responded:
October 26, 2023
Hello, With this combination of attachments, you could have either the S380-27 or S385-27 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 2640 spring strength options for your replacement balances. Comparison of the S380 and S385 balance shoes.
If you'd like us to confirm if the 18-188 would be our best match for your top sash guide, we would need to see photos of an undamaged part removed from one of your windows. Thank you! Alternate view of 18-188
Alternate view of 18-188
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