Andersen Window Sash Balance

A home owner from Massachusetts says:
We have a Andersen Window Sash balance stamped J58 5#23 5 80, It's from an Andersen window, house was built in 1979.Can you let me know the correct replacement part.

Thank You
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Tom from SWISCO responded:
I think you should consider our 23-531. This can replace balance boxes with the stamp 5#23.
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