Replacement Window Balance, 18" Long

Hello,

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 stamp in your first photo appears to be 26 5, which would normally indicate that you need 27" balances with a 2650 strength option. 

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

Comparison of the S378, S380 and S385 balance shoes.