s balancers part number

A handy person from Pittsburgh PA says:
I have a Traco window and has Anderson balancers the numbers I see on the part are as follows 11600-3 And D39 8#31 686
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Tom from SWISCO responded:

Hello! Based on your stamp of "8#31," I recommend our 24-837 Andersen sash balance. Please let me know if you have any questions!

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