Window Channel Balance

A home owner from Clovis, CA says:
Do I need to replace the whole balance or can I get just the string that hold the tension? The measurements are L-28? - W-1/2? - D-1/2? What would be the correct size needed to replace? Thank you.
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Bob from SWISCO responded:

Thanks for writing in. This looks like our S350-28. You will need a stamp option of 2740. 

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