Casey from SWISCO responded:
January 2, 2024
Hello, With this combination of attachments, you could have either the S380-24 or S385-24 channel balance. You’ll need to measure the depth of an undamaged balance shoe from one of your widnows 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 to locate the stamp code on your metal channel to choose the corresponding spring strength options for your replacement balances. If the code is worn or missing, there is a chart on the product page that explains how to choose your option based on the sash weight. 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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