3440 channel balances
Hello
With this combination of attachments, you could have either the S380-35 or S385-35 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'll also need 3440 spring strength options for your replacement balances. Thank you and let us know if you have any other questions or concerns.
The length of the spring is not used to identify replacement balances. The length of the metal channel, not including the end fittings, would be the determining factor. If you have other balances with 21" long metal channels, see the S380-21. Otherwise, you would need the S380-35 (3440) balances based on your original photos.
In that case, the S380-35 (3440) channel balances would be the way to go.
Correct, 3440 would be the option needed for your balances based on your original stamp code. The option corresponds to the strength of the springs, which will support a sash between 23-30 lbs.
Your top sash guide looks like a match to the 18-161. Review the dimensions below to confirm and let us know if you need anything else.
We aren't able to make out exact dimensions from photos but the measurements you provided are very close to ours. The 18-161 is also the only top sash guide in this style that we offer. I believe you'll be able to use this guide for your repair but if you decide to give it a try and run into any issues, our return policy can be found here.