Window balancers

With this combination of attachments, you could have either an S380 or S385 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. 

The 15" balance shown in your photos appears to have a 1410 stamp, which would require a 1410 strength option. If you have other balances stamped with 1420, then you would choose the 1420 strength option for those balances and 2020 options for the larger 21" balances. 

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

Comparison of the S378, S380 and S385 balance shoes.