Andersen Sash Balance

A home owner from Belmont, MI says:
August 14, 2019
I'm trying to replace my window sashes, but there doesn't appear to be a stamped number in the same place as the newer versions.

The bottom is stamped with: P15 12#31 9 79

Can you tell me what a good replacement for this part would be?

Thank you!
Thumbnail of the uploaded file named 12#31
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Paul from SWISCO responded:
August 20, 2019

Our 24-1231 Andersen sash balance box will replace your balance stamped with "1231". 
Andersen Sash Balance, 1226, 1227, 1231
Andersen Sash Balance, 1226, 1227, 1231
24-1231
$54.20
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