Casey from SWISCO responded:
June 14, 2022
Hello, With this combination of attachments, you could have either an S380-27 or S385-27 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. Based on the 26 5 stamped on your metal channel, you'd also need 2650 spring strength options for your replacement balances. With that being said, I would recommend weighing your sash and following the chart below the balance product description to confirm that the strength option you choose has the correct weight range to support the window sash. 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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