Replacement part

A handy person says:
I have a Small double hung window. The part numbers on it are 11600-2.
Or B57 4#19 3-80.
Thanks for any help you can give.
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Paul from SWISCO responded:

Our 24-431 Andersen sash balance box should replace your balance marked with the "4#19". Look it over and let us know if you have any further questions. 

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