Casey from SWISCO responded:
March 15, 2022
With this combination of attachments, you could have either an S380 or S385 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 to weigh your sash to determine which option you'll need. There is a chart on the product page that explains how to choose your option based on the sash weight. As for your top sash guide, take a look and compare the specifications of the 18-124P guide pair 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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