Picking out a spiral balance

A home owner from Erma, NJ says:
I have a mobile home. The spiral balance has an orange cap, the gray cylinder is 26" long, and the diameter is 1.5" (not including the white metal sheath it sits in.)

Which one should I order?
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A home owner from Erma, NJ says:
I forgot to tell you, it's a tilt window, double hung.
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Tom from SWISCO responded:

Can you confirm the diameter of the outer tube? I've never known any balance made that is 1-1/2" in diameter. That's huge.

I think it will be closer to 3/8". If I'm right, then you want our S900-26.

A home owner from Erma, NJ says:
Thanks, I'll re-measure.
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