Emily from SWISCO responded:
October 15, 2021
Hi, Curtis. Thanks for your patience during our busy season. With this combination of attachments, you could have either an S380-28 or S385-28 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 2730 spring strength option. If you have any questions just let us know! Comparison of the S380 and S385 balance shoes.
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