Help with Balance Spring

A quick learner from North Carolina says:
February 14, 2021
Need help in choosing the correct coil balance spring. Broken spring is 1/2 inch thick with no markings. Seems to be a match with your Series 190 but I don't know which one (440-940). Window dimension (glass portion) is 26 3/8 inches X 25 7/8 inches.

Also, can you please confirm that the below are what matches with the picture? Is there a complete set/kit available? I would need both left and right.
15-180 Coil Balance Shoe
15-186 Coil Balance Clip
15-182 Balance Bushing
Thumbnail of the uploaded file named IMG_8925.JPG
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Casey from SWISCO responded:
February 16, 2021

Hello,

I agree that your photo looks like a match to our 15-180 pivot shoe, as well as the list of related items on the product page. 

As for your S190 coil springs, there should be a stamp on your original coils that indicate the strength option you need. If not, you'll need to weigh the window sash and divide the weight by the number of coils in the window to choose the correct strength option. Thank you!
A quick learner from North Carolina says:
February 16, 2021
Hello there,
Thank you for the response. Window sash weighs 16.8 lbs. So, 2 X 940 S190 coil springs is the correct strength option?
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Casey from SWISCO responded:
February 17, 2021

I'd recommend using one S190-840 coil spring on each side to support your sash weight. Thank you!
Coil Balance Shoe
Coil Balance Shoe
15-180
$3.97
Coil Balance Clip
Coil Balance Clip
15-186
$5.05
Balance Bushing
Balance Bushing
15-182
$1.80
940 S190 Coil Balance Spring
940 S190 Coil Balance Spring
S190-940
$11.94
840 S190 Coil Balance Spring
840 S190 Coil Balance Spring
S190-840
$11.32
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