Casey from SWISCO responded:
December 5, 2022
Hello, With this combination of attachments, you could have either an S380-24 or S385-24 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, you can start by comparing the dimensions of the 18-166 to yours. If you notice any discrepancies, please show us an undamaged guide, as well as write-out your exact dimensions, and we can go from there. 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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