andersen narroline balances

A quick learner from Rhode Island says:
I have older andersen narroline windows. I need balances. the numbers on my windows are D19 7#27 884 and D15 7#27 784. What model numbers do I order?
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Tom from SWISCO responded:
Hello! I recommend our 24-737. This can replace Andersen sash balances stamped with "7#27."
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