need replacement part for the Spiral Window Balance

A quick learner from NC says:
see the picture that the while shell is 28" x 9/16", with tip measured about 29", which replacement is the right one? I may need over 12 pieces.
User submitted a photo of window hardware.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting. Considering the diameter of the outer tube is 9/16", I would recommend our Series 600 spiral balance for tilt windows as a replacement.
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