Lauren from SWISCO responded:
December 1, 2021
Hello, thank you for posting! With this combination of attachments, you could have either an S380 or S385 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. Please confirm that the length of your metal channel is 36". You have an older stamp on your balance that does not correlate to our stamp options. You will need to obtain the weight of the window sash and refer to the strength chart on the product page to choose the correct option. Please let me know if you have any questions. Comparison of the S380 and S385 balance shoes.
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