Alcan window balance 3630

Hi Fred, 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.

You will need a 37" balance with a 3630 stamp option.

If the bottom shoe measures 7/8" deep instead, please let me know as this will require a custom configuration. 

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

Comparison of the S380 and S385 balance shoes.