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Casey from SWISCO responded:
May 12, 2020
Hello, Stamp numbers indicate the strength of the spring but, unfortunately, not the style of the balance that you need. With this combination of attachments, you could have either an S380-35 or S385-35 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 3430 spring strength option for your replacement balances based on the stamp number. 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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