Window sash balance replacemeny

Hello, thank you for posting,

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. 

To choose the correct stamp option, you will need to obtain the weight of the sash and compare to the strength chart on the product page. 

Please review and let me know if you have any additional questions. 

Comparison of the S378, S380 and S385 balance shoes.