Window balance strings

A handy person from St. Louis , Missouri says:
I have window balances that have 2 sets of numbers. They are L5310#3110-85. & 11600-17. What balance do I need to order?
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Tom from SWISCO responded:
Are these balances for Andersen windows? If so, I recommend our 24-1033 based on your stamp of "10#31." Please confirm that "10#31" is stamped a little more prominently than the other numbers, perhaps in a larger font or off by itself. That's an important distinction to make.
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