Window Balance Indentity Help Please

Handy Person from Winter Garden, FL
The metal part is exactly 29" long, 9/16" wide, and 1/2" deep. Stamp on it os 28C USB. Photos attached.
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Bob
Bob from SWISCO
SWISCO
Expert

Thanks for posting. It's possible that this is an S380-29 Channel Balance. Just make sure the depth of the bottom nylon shoe is 1". The depth is the measurement from 'heel-to-toe'. See the diagram below for reference. Measure your old balance's shoe to see if it matches. Let me know if it is not 1". 

Assuming it is a 1", then you have a S380-29. Choose 2830 as a stamp option. Let me know if you have any questions. 

Comparison of the S378, S380 and S385 balance shoes.
Comparison of the S378, S380 and S385 balance shoes.

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