Window doesn't stay up

A quick learner from 08085 says:
Window is 35 x 31( top and bottom) Pictures attached
S8 1031 12 87 or 11609-17. I need the left and right side.
User submitted photos of an Andersen window balance.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for the great pictures. I recommend our 25-1033. This can replace Andersen balance boxes stamped with 1031.
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