Window channel balance

A quick learner from Oregon says:
Need to of above 21 inches long?. Markings say 2040CD and along the edge is B.S.I.
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Bob from SWISCO responded:

This looks like either our S380-21 or S385-21. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. See the image below for reference. For a new stamp option in either case choose 2040. 

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
A quick learner from Oregon says:

Thanks so much for ur help!! Window balances have been ordered from Swisco!

Sincerely,

Cynthia!!

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