Casey from SWISCO responded:
March 17, 2021
Hello, It looks like both the top and bottom attachments on your balance have wings. If so, you could have either an S380-31 or S385-31 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. For a 35-pound window sash, you would need 3060 spring strength options for your replacement balances. That being said, I would recommend weighing your sash to confirm the correct option. There is a chart on the balance product page that explains how to choose your option based on the sash weight. 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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