J62 5#31 window balance

A quick learner says:
the number is corroded off somewhat, but it looks like J62 5#31 it looks like the date on it is 11/80 the window size is 24" X 54" approx dbl hung. which balance replaces this one?
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Tom from SWISCO responded:
Is this for an Andersen window? If so, I recommend our 24-531. This can replace all Andersen sash balances stamped with "5#31."
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