window channel balance

A home owner from Los Angeles, CA says:
My window channel is stamped 26C USB. The channel length (metal only) is 27inches, width is 9/16 inch, and channel depth is 5/8 inch. Which channel balance is the closest match?
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Paul from SWISCO responded:
I see you were looking at our S380-27. Is this what you have? If so, I recommend our 2630 option, though you can weigh your sash and compare to our S380-27 option chart to confirm.
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