Anderson Sash Balances

A quick learner from Wanaque, NJ says:
I need to order 3 Anderson Sash Balances but I can't find corresponding numbers on your site. The numbers stamped on the unit are E48 , 9#27 the windows were installed in 1979. the date stamped on the unit is 10/77.
Thanks for your help. Steve
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Tom from SWISCO responded:
I recommend our 24-939. This can replace Andersen balance boxes stamped with 9#27.
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