Please help me with channel balance

A quick learner from clearwater, fl says:
12 inches...9/16 th wide.. old window from 1990's...
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Bob from SWISCO responded:

I believe this might be an S377-12 Channel Balance. Review the dimensions and see if this matches the specifications of your old balance. I believe the old balance's stamp reads 11-2. If so, choose 1120. 

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