Casey from SWISCO responded:
June 15, 2018
Hi Susan, With this combination of attachments, you could have either a S380 or S385 channel balance. You 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 1440 spring weight option for the correct balance. Thank you and let us know if you have any other questions or concerns. Comparison of 15-004 and 15-005
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