Two Andersen Sash balances

A quick learner from Woburn Massachusetts says:
I am looking for two balances one number is
E87 9#27 3 84 and number E6 9#27 3-81 could you please tell me what balances I need.
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Tom from SWISCO responded:
Thanks 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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