Andersen sash balance

A quick learner says:
I have old Andersen windows with string balance..... the code stamps on one size is E19 9 27 4? ....and 615 10 31 R71 this second number is a cottage window so will need opposite balance as well
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Tom from SWISCO responded:

Hello! Based on your stamp of "9 27," you can use our 24-939 as a replacement. 

Let me know if you had any questions.

A quick learner says:
What about the other one?
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Tom from SWISCO responded:

I apologize for missing that second one. Since the stamp on that is "10 31," I recommend the 24-1033.

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