Anderson replacement balance

A quick learner from wisconsin says:
Help, I was able to get this balance out of the window and take a picture of it and need to replace a few of these. I was not as fortunate with another window but was able to get the number E50 9#31 11-86. Can you help me find both of these replacements?
User submitted a photo of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Hello! I'm a little confused. You say in your post that the stamp is "9#31," which is normal, but the key stamp in your picture reads "1031." Do you need two different balances? If so, I recommend our 24-939 for the balance stamped "9#31" and our 24-1033 for the balance stamped "1031."
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