Emily from SWISCO responded:
October 11, 2021
Hi, Liz. Thank you for your patience during our busy season. 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. If your sash weighs exactly 18.7 pounds, you'll need the 2530 stamp option. This is for a sash weighing 15 to 19 lbs. Comparison of the S380 and S385 balance shoes.
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