Andersen Balance, E41 9#27 9-77

A quick learner says:
I have Anderson windows with the number E41 9#27 9-77 stamped on the sash balance casing. I would like to know what number I would need to order.
Thanks
Christine
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Donna from SWISCO responded:
Hi Christine,
You will need the 24-939, Andersen Sash Balance
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