Emily from SWISCO responded:
October 14, 2021
Hello there! With this combination of attachments, you could have either an S380-26 or S385-26 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. To determine the appropriate spring strength option, you'll need to weigh your sash on a scale. There's a chart on the S380-26 and S385-26's store pages that will show you which option you'll need based on the weight of your sash. If you have any questions just let us know! Comparison of the S380 and S385 balance shoes.
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