broker window coil balancing spring

A quick learner from Chicago IL says:

The coil balancing spring was broker. I checked your website and find the matching shoe (please refer to the picture and let me know if I am wrong). It showed S190-740 as related spring. But I can't find the length of the spring. My window is about 30 inch along the window track side. the width of the spring is about 0.51 inch

Please advise. thanks.
User submitted photos of a coil window balance.
Profile picture of Paul
Paul from SWISCO responded:
I agree with the hardware you picked out, the 15-180 and Series 190 look to be the right choices. What is the n umber stamped on your spring?
A quick learner says:
The stamped number is 8
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Paul from SWISCO responded:
Thanks. In that case, I recommend the S190-840.
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