Casey from SWISCO responded:
May 13, 2021
Hello, With this combination of attachments, you could have either an S380-30 or S385-30 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. I'd also recommend weighing your window sash to confirm that it is exactly 48 pounds since they will have to be custom-made due to the spring strength required. Once we've confirmed your sash weight and the depth of your bottom attachment based on an undamaged balance, we can get a price quote together for you. 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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