Late 1970s vintage Anderson Double Hung Windows Sash Balancer

A quick learner from Beaver Falls Pa says:
Hello. I'm trying to replace the sash balancer for 1970s vintage Anderson double hung windows. There isn't much of a part number on the case. Only E7 8 31 1. The top pane measures 23-7/8" tall and the bottom pane 36" tall. Width is 28-1/2".
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Tom from SWISCO responded:

Hello there! Based on your stamp of "8 31," I recommend our 24-837 Andersen sash balance.

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