Andersen Counter Balances

A quick learner from falling waters says:
I need two Anderson Counter Balances for a double hung window. Each pane is 28.5" wide by 20" high. My old counter balances have 11600-2 stamped on them in one spot and D 92 7#27 7 79 stamped in another spot. None of these numbers correspond to model numbers I see on your products.
Which ones do I need?
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Tom from SWISCO responded:
Hello! Based on your stamp of "7#27," I recommend our 24-737 Andersen sash balance.
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