Anderson window sash balance replacement

A home owner from Pittsburgh says:
I can't seem to match up my sash balance to the parts you sell online. From what i can make out i can see the following items marekd on the sash balance:

600-17 and BL6 10#31 11 84

You can see these on the pictures i attached. Please help me figure out which part i need to order.

User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Check out our 24-1033. This can replace Andersen balance boxes with the stamp 10#31.
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