Andersen balance

A home owner from Silver Springs, MD says:
I am looking for replacement Andersen Window sash balance. The original part # is 11600-17 and D82 7#31 5 87 (not 100% sure about the 87). It is a double hung window, upper and lower panes are of the same size, and window pane size is 20-1/2 W x 27-3/4 H. I believe the window is 25 years old.

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Tom from SWISCO responded:
Hey, Roger. I recommend our 24-737. This can replace balance boxes with the stamp 7#31.
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