Andersen Narrowline 200 Balancer Identification

A home owner from Lino Lakes, MN says:
January 21, 2021
I recently bought a home built in 1977 that has 1 Andersen Narrowline 200 Double hung window. I am rebuilding the window and want to be sure to get the right balancer. The numbers on the old one don't match up to anything I see on your website. See attached photo of the old one.
Thumbnail of the uploaded file named IMG_20210121_120257.jpg
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Tom from SWISCO responded:
January 25, 2021

Hello! Based on your old stamp of "5P23," I recommend the 24-531 Andersen sash balance.
Andersen Sash Balance, 519, 523, 525, 527, 531
Andersen Sash Balance, 519, 523, 525, 527, 531
24-531
$54.20
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