Window sash replacement hardware needed

A quick learner from Cary, NC says:
I need some replacement parts that look like this. Behind the white plastic piece is a metal coil spring. There are two coils on each side. These are single hung vinyl windows. I can find no other identification on the window.
pivot shoe
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Paul from SWISCO responded:
This pivot shoe closely resembles our 15-199, which in turn uses our 1/2" wide Series 160 coil spring. See what you think!
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