Anderson Window Balance

A quick learner from Alexandria, VA says:
I'm looking for a replacement balance for my Andersen window. I was able to identify the following part numbers on my current balance:

11600-17
D26 8# 31 11 84

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Paul from SWISCO responded:
Based on your stamp of "8#31," we recommend our 24-837. Look it over and see what you think.
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