Verify part number

A quick learner says:
23 7/16" long.
3/8 diameter.
User submitted a photo of a window balance.
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Tom from SWISCO responded:
Thanks for posting. I'm confident we can help you replace this, though we will need a bit more information. There should have been a tube wrapped around the outside of this balance, probably made of white plastic. Can you tell me the length and diameter of this tube? Since the diameter of the inside spring is 3/8", I would bet the diameter of the outer tube was 5/8". If that's the case, look at our Series 600 spiral balance.
A quick learner from Garden City says:
OK, The pix I sent was w/o outer tube, thanks for your diligence.

The outer tube dia is 27/64, (3/8)

Series 900?
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Tom from SWISCO responded:
Ah, gotcha. If the outer tube is 3/8", then I recommend our Series 900 instead.
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