Sash balance replacement for 11600-2, Andersen Window

A quick learner from New York says:
Good morning, looking for the proper replacement for sash balance 11600-2, E17 9#27. Can you tell me which one I need?

Thank you
User submitted a photo of an Andersen window balance.
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Tom from SWISCO responded:
For this balance, I recommend our 24-939. This can replace Andersen balance boxes stamped with 9#27.
A home owner from Lansdale, PA says:
I also have # 11600 2 that I need to replace. It has following on it: # 146 5#23 4-79. Would 24-939 be correct to replace it, or is there another part?
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Tom from SWISCO responded:

No. Since your stamp reads "5#23," you want the 24-531 instead.

The 11600 stamp isn't important and should not be used to identify a match.

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