13 inch window balance non-tilt

A quick learner from Bellevue WA says:
My balance says 13 5 it is a 385 series
how long to make this please.
thank you
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Mike from SWISCO responded:
Simply measure the metal bar to determine the proper length. It may be 14", based on the stamp, but the stamp is a particularly poor way to try to choose a balance length.
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