Window balance coil

A quick learner from USA says:
I need help finding this kind of window balance coil online. Can you guys please provide me with some options that might be relatively close to this one.
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Casey from SWISCO responded:

It looks like you have an older version of the 15-251 single support, which uses the 1/2" thick S160 coil springs. The 9.0 stamp on your part indicates that you will need one S160-9 coil spring on each side. We also offer the 16-031 mounting bracket shown below. Take a look and compare the specifications to yours. Thanks for posting!

Measurements of 15-251
Measurements of 15-251

Dimesnions for 16-031
Dimesnions for 16-031

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How to replace a window coil balance
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