window spring from a unit sold at lowes in 2007. heli coil spring is what is broken

A quick learner from Lexington, KY 40515 says:
May 13, 2013
I'm trying to help a neighbor repair a window spring which is broken. I think the company who made the spring has gone out of buisness. I think it might be invision. I have sent several pictures of the spring. I will have to take the window apart to get the spring out.

Need to know if you can sell me two springs one left and one right?

Waitung to hear from you window is 32Wx 38H almond color purchased in 2007.

I took the srings out to see if the coils had numbers, but they did not then I noticed the two holders had Paten Numbers so I took a picture for you to see. Looks lke the springs are 8 pounders , cause they are number 8L and 8R.

Hope this gets me a part number to order 2 of these.
User submitted photos of window hardware.
PAT 5,353,548
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Tom from SWISCO responded:
May 16, 2013
Thank you for posting! It looks like the pivot shoe is something like our 15-087, and so the springs might be our Series 180 coil. However, we do not have the 8 pound option. We are currently working on it, though, and I will post here again as soon as it becomes available online for you to see.
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Tom from SWISCO responded:
June 6, 2013
Alright, take a look at our new S180-8 coil spring. Each spring can support 8 pounds.
Coil Housing Pivot
Coil Housing Pivot
15-087
$5.97
8 lbs Series 180 Coil Balance
8 lbs Series 180 Coil Balance
S180-08
$5.15
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