Window spiral tilt spring

A home owner from Burlington, NJ says:
Please help me identify the replacement length for my spiral tilt window spring. The one I removed from the window measures 28-7/16" (length of metal casing), diameter is 3/8". Looks like a red tip, but the tip is pushed in. Do I need a 28" or 29" replacement?
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Paul from SWISCO responded:
Based on your measurements, I recommend our S900-29 balance. I think that should work for you.
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