Andersen Sash balance ID

A quick learner from USA says:
Can you tell me which sash balance replaces this one?
User submitted a photo of a window balance.
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Tom from SWISCO responded:
I sure can. I would recommend our 24-939, based on your stamp of "9#27."
A quick learner from Greenville Me. says:
I need to replace both sash balances. Can you assist me on the right ones to fit my window? The old ballance has the number 5#27. Thank you,Marty Lombardo
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Tom from SWISCO responded:
Thank you for posting, to ensure we find the right sash balances for you could you provide us with a picture and some measurements?
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