aluminum non tilt window part

A quick learner from loxley, al says:
Aluminum non tilt windows. lower sash weighs 10lbs tubes are 25" long and are 9/16 diameter. House was built in 1967, almost all are broken. some of the lower brackets are bent.
There are 13 windows this size I would like to repair. Would like exact replacement, but could modify lower attachments if required.
Thanks,
Randy
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Paul from SWISCO responded:

Thanks for posting! Your balance system is no longer being made. Fortunately, you can use our S500-25 red tip spiral balance and a 17-012 balance bracket. Let me know if you have any questions.

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How to Identify a Replacement Spiral Balance
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