aluminum window - sash channel balance 9/16" x 36"

A quick learner says:
need two of these for a single hung aluminum window. House built by Del Webb in 1979 and located in Sun City West, Arizona.
Thank you
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Tom from SWISCO responded:
Thanks for posting. I have received your pictures, but they are a little unclear. I cannot make out what balance Series it is you have. I recommend that you look at our Channel Balance Home Page and follow the steps in order to find the Series that best matches what you have.
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