Hello,
With this combination of attachments, you could have either the S380-24 or S385-24 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.
You'll also need 2330 spring strength options for your replacement balances. Thank you and let us know if you have any other questions or concerns.
Great, then you can purchase the S385-24 (2330) channel balances directly on our website. Thanks for posting!
Your 23 3 stamp indicates that you will need a 2330 option to support a sash between 15-18 lbs.
