spring for double hung vinyl window -possibly owens corning

A home owner from Branson Missouri says:
February 4, 2017
The spring on the inside of this rod is broken. We need to find out what part it would be please. The rod is 28 inches long. Rod is not quite 1/4" in diameter. Thank you.
User submitted a photo of a window balance.
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Paul from SWISCO responded:
February 10, 2017
Can you confirm the diameter of the outer tube? It should be either 3/8" or 5/8". If it's 3/8", we recommend the S900-28. If it's 5/8", consider the S600-28 instead.
28" Series 900 Spiral Balance
28" Series 900 Spiral Balance
S900-28
$9.10
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