What Certainteed Coil Springs do I have?

A home owner from Springfield, Virginia says:
Yea I am a homeowner that had windows installed about 20 years ago. These windows were Certainteed, I believe Devon was the style, double hung window tilt down. We have 2 windows that will not stay open when the bottom portion is lifted up and are looking to fix these. If you could help identify the parts we need that would be great. If the parts are even still manufactured.
The pictures included are from the part that came out of the window. The only number we could see on the part is "407" on the silver coil. The plastic had no identifiable markings.
User submitted photos of a coil window balance.
Profile picture of Paul
Paul from SWISCO responded:
I think you should look at our 15-192 pivot shoe and S170-407 coil spring. Look them over and see if you agree. Also be sure to watch our video on installing coil springs.
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