replacement springs for my single hung window

A quick learner from Hawaii says:
March 19, 2018
Hello,

I am trying to find replacement springs for my single hung window. See attached for approximate dims. The metal part is 22" long. The engraved number looks like 21209 or 2120 upside down G, with a small B&I next to the serial number. There's no manufacturer marking anywhere on the part or the actual window.

There's one spring on each side of the window, but you can't see it when it's installed. Please let me know if you need more information.

I appreciate any assistance you can provide. Thanks!

-Ryan
Channel Balance
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Paul from SWISCO responded:
March 23, 2018

Start by looking at our S350-22 channel balance. This comes with the 19-002 top and 15-004 bottom. As long as those match up then I think this will be a great replacement. 
22" Series 350 Channel Balance
22" Series 350 Channel Balance
S350-22
$9.91
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