Emily from SWISCO responded:
January 18, 2022
Hello! With this combination of attachments, you could have either an S380-31 or S385-31 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 stamp is "30 3", you'll need a 3030 stamp option. Comparison of the S380 and S385 balance shoes.
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