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Casey from SWISCO responded:
May 30, 2019
Hello, You'll need to confirm if your bottom attachment has wings like your top attachment does. If it does, this combination of attachments could be either a S380-20 or S385-20 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 need a 1940 spring strength option for your balances. Thank you and let us know if you have any other questions or concerns. 
Comparison of the S380 and S385 balance shoes.
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