Replacement window balancer

A contractor from Pine hill nj says:
I need to replace window balancers in old wooden windows. Not sure if you would have replacements. I thought they went up through the top of the frame but I could be mistaken.
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Casey from SWISCO responded:

Hello,

It looks like you might need either our S400 or S500 spiral balances for non-tilt windows but you'll need to remove yours and measure the tube length and diameter to choose the correct replacement. Thank you!

A contractor from Pine hill nj says:
Hello.
Tube is 23 1/6 long (plastic)
Yellow bushing
Appears to be a tiny bit over 1/2 inch wide
Lower mount bracket about 2 1/2 long under window
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Casey from SWISCO responded:

Take a look and compare our S500-23 spiral balance with a 5/8" diameter tube, as well as the 17-012 bracket. Thanks for posting! 

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