anderson sash balance

A quick learner from New Baltimore New York says:
What is the correct replacement sash balance for D87 727 9-87?
Are there left and right units or simply order multiple of the same replacement part? Working on two windows at this time. Thank you.
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Paul from SWISCO responded:
Thanks for posting! I recommend our 24-737 Andersen Sash Balance, which can replace balance boxes with the stamp 727. This part is non-handed, too, so you won't need a different part for each side.
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