22 Inch Window Balance 2140 NK

A quick learner from Los Angeles says:
I am looking to replace a pair of window balances The number stamped on them is 2140 NK (see attachment RenderedContent-54D1AD80-2DBF-4222-87E0-CDA8F7DDB0EE.jpg)

The channel is 22 inches long, 1/2 inch wide and 9/16 inches depth.

I do not know how to identify the clips.
Channel Balance
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Casey from SWISCO responded:
Trying to identify the proper channel balance can be a little scary because they all look similar. I am sure we can find what you need with some additional help from you. Could you send us some photos of the complete balance along with photos of the top and bottom nylon balance shoes? From there, we can start to narrow down the options for you.
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