anderson window balance 9#27

A contractor from quakertown pa. says:
the balance i have has the numbers 11600-17 and e64 9#27 7 87the glass panes are about 36"w x 22"h what balance should i be using
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Paul from SWISCO responded:
Thank you for posting! Please take a look at our 24-939 Andersen sash balance. This can be used to replace balance boxes with the stamp 9#27.
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