Replacing Caldwell Chanel balances

With this combination of attachments, you could have either a S380 or S385 channel balance. You need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. These stamps are correlated to balance of different lengths. Once you measure the metal channel of each balance, you'll need a 2530 option for your longer balance. The shorter balance has an outdated stamp, so you'll need to weigh the bottom sash and choose your option based on the stamp under our product description. 

Thank you and let us know if you have any other questions or concerns.