Sash restoration

A quick learner from Tampa, Fl says:
Double hung wood sash. Non tilt window. I don't know the weight of the sash. The plastic outer tube crumbled while dissembling the window. I took the measurement from the top to where I think the bottom is, but you can see the spring extended from the bottom of the balance. I assume I'm looking for the Series 500 and bottom 17-012. Thanks in advance for the help.
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Casey from SWISCO responded:

Hello,

I agree that the S500-27 spiral balance and 17-012 bracket are most likely the parts that you need. Since the outer tube of your balance is missing, the S400 is also a contender but since older wood windows are usually on the heavier side, the 5/8" thick S500 would be a better option. Thank you!

A quick learner from Tampa FL says:
Just to double check. I should go with a 27in length correct? I assume the plastic tube ended at that mark.
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Casey from SWISCO responded:

Yes, that is correct. 

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