Channel balance piece

A handy person from 92011 says:
no identifying markings. Piece is 9/16" wide and 28" in lenghth (metal portion) The window is 11.6 lbs.

Which channel balance do I order ?
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Thumbnail of the uploaded file named IMG_0040.JPG
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Lauren from SWISCO responded:

Hello, 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.


Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
You will need a 28" balance with stamp option 2720. Please let me know if you have any questions! 
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