Sash window balance

A home owner from Pa says:
Looking for 2 new window balance units. See pis of old. Numbers on unit: D1 9 27 3 7A. Can you let me know which is part number for replacement. Thanks in advance. John
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Based on your stamp of 9 27, I recommend our 24-939 Andersen sash balance.
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