37" balance
I believe these are S380 , 27" long , sash weighs 26.4lbs
Option 2640 or 2650 ?
Hello,
With this combination of attachments, you could have either the S380-37 or S385-37 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 3640 spring strength options for your replacement balances to support a sash between 23-30 pounds. Thank you and let us know if you have any other questions or concerns.
Unfortunately, we are not able to determine exact dimensions from photos. You'll need to confirm the shoe depth needed for your balances to choose the correct replacements.