ID Channel Balance Help

Handy Person from Santa Rosa, CA
Need help identifying the correct series of original balances. They look like 350 but would appreciate confirmation. They are 27" in length. Will need four of them. Thank you!
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Bob
Bob from SWISCO
SWISCO
Expert

Hello there. I am confident we can help, but I'd like to verify one further detail. Do you have a version of this balance with the inner 'guts' or underside intact? Perhaps the other balance from this window, or an identical window in the house? If so, can you remove it and send us photos of the underside in full? Some balances from your region have a unique configuration we must account for. Please show us this and we'll go from there. 

Handy Person from Santa Rosa, CA
Here are some additional photos. Best I can do.
4 user uploaded images
Bob
Bob from SWISCO
SWISCO
Expert

Thanks for getting back to me with these photos. Because both nylon attachments have 'wings', or side tabs, I think this is either an S380-27 or S385-27 channel balance. The only difference between these two balances is the 'depth' of the bottom nylon shoe, or the 'heel-to-toe' measurement. See the diagram below. Measure your old shoe's depth to see what matches best. For a stamp option choose 2650.

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.

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