replacement balance

A quick learner from USA says:
looking for replacement balance. Windows at approx 36 years-vinyl jamb liner
User submitted photos of a window balance.
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Paul from SWISCO responded:
I believe you have a Series 751 ribbed channel balance, which comes with the 15-014 tilt shoe. Look this hardware over and see if it matches up to what's in your window. You will need the length of the metal channel and the stamped number when ordering.
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