window parts and balance

A handy person from Arlington VA says:
if length of open window it is 74" (inches) which is the side of balance 34.5/ 36.5/ or 38.5
which one do you think are the proper side. and for 62 open window length. Julio,thanks.
Profile picture of Paul
Paul from SWISCO responded:
You don't measure the window at all. Instead, you need to measure the balance itself. Check out the image below to see exactly what you have to measure to determine length.

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