Window Spring balances

A home owner from USA says:
I've attached some pictures of my window balances. I know this may not be sufficient for you to identify the specific parts I will need, but before I take the step of actually removing the window and measuring the individual parts, I was hoping you could tell me if you can tell if your spiral balances are compatible with my windows at all. I hope these pictures are sufficient. The windows are large and heavy, the lower pane is about 52" wide and 44" tall, double-pane thermal glass, aluminum frame.

Thank you,
User submitted photos of window hardware.
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Tom from SWISCO responded:
Thanks for posting, Milo. I'm pretty sure our balances can work for you, yes, though you may have a unique, extra strong type. What is the diameter, legnth, and color of the outer tube? Can you also tell me if anything is stamped on this tube?
A handy person says:
The balances are 5/8" diameter, about 44" long. The tube is metallic grey and there is no colored bushing anywhere on the tube, so there is no other color to report. I don't see anything stamped on the tube, but as I noted earlier, I haven't actually taken the window out yet.
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Paul from SWISCO responded:
Thank you. If there is nothing marked on the tube, we will need the weight of the sash. That will allow us to determine the proper strength of the spring.
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