alum. double hung balance

A contractor from Cos Cob Ct says:
This is a balance from a aluminum double hung window in a town housing unit.
Windows are approx. 7 yrs old. There are 3 different heights/sizes according to the window size. According to the super the name might be Alslide of Akron Ohio. I checked their website nothing seemed to match.
If you need any other info please let me know.
Thank You

Alex
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Casey from SWISCO responded:

Hello,

Take a look and compare our 15-251 support, which uses the Series 160 coil springs, to your original hardware. Thank you!

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