Lauren from SWISCO responded:
December 8, 2023
Hi Bill, thank you for posting, If the top attachment is winged out like the bottom shown, 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. The 22 9 stamp does not directly translate to our spring strength options. To determine the correct stamp option, you will need to weigh the window sash and compare to the strength chart on the product page. Please review and let me know if you have any additional questions. Comparison of the S380 and S385 balance shoes.
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