Emily from SWISCO responded:
September 30, 2021
Hello! With this combination of attachments, you could have either an S380-30 or S385-30 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 a 2950 stamp option. As for the sash guide, take a look at our 18-161 and see if our dimensions match up to yours. If your bottom fitting indeed measures as 7/8", like the 15-029, let us know and we can go from there. Comparison of the S380 and S385 balance shoes.
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