Andersen Balance numbers

A quick learner from USA says:
Need to replace sash balance box and can't find any that match the numbers on the box. Numbers on the box 11600-17,11600A-3. Other numbers on side of box 931 and R38 399. Please let me know if there is one that will match up. Thank you
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Paul from SWISCO responded:
Based on your stamp of "931," I recommend our 24-939 Andersen sash balance.
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