Andersen narroline sash balancer

A quick learner from New York says:
print on part is
E42 9#27 5-77

I have 3 windows
the 2 larger are 36 15/16"w x 23 15/16"h
the smaller is 36 7/18"w x 19 15/16"h

I need to replace all sash balancers for these which would be 6 in total
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Tom from SWISCO responded:
Thank you! Please take a look at our 24-939 Andersen sash balance, which can be used to replace balances with the stamp 9#27.
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