Window part
Hello,
We'd be happy to look into this for you, but unfortunately, the stamp code only indicates the strength of the spring. We'll need to see photos of an intact balance removed from your window, including both ends of the metal channel and pulley clip, to compare to our inventory. Thank you!
With this combination of attachments, you could have either the S380-21 or S385-21 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. Also, make sure to confirm your metal channel measures 21" long without the end fittings.
You'll also need 2020 spring strength options for your replacement balances based on your 20B stamp. Thank you and let us know if you have any other questions or concerns.
