Proper size of spiral spring

A handy person from Alexander, NY says:
The spiral spring on my tilt in window is bad. It's 5/8 inch across and the length measured from the end where the screw holds it the beginning of blue tip is 28 3/8 inches. I' need to know which spring will meet my needs- the 28" or 29" ? Thank you for helping me out.
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Paul from SWISCO responded:
Based on your current size, I recommend going with our S600-28 spiral balance, with a Blue Tip, of course.
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