Looking for correct spiral balance tube for Acorn Windows

A home owner from Fenton says:
September 23, 2017
Need to find the correct replacement spiral balance for the Acorn tilt windows in my house. Acorn is no longer in business.
Spiral Balance tube length 28 1/2 inches.
Spiral balance tube width 3/8 inch.
Full window assembly size 35 inches X 59 inches.
Lower sliding window pane size 33 inches X 30 inches.
Lower sliding window weight 18.2 Lbs.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
September 28, 2017
Going over your photos, I recognize the 15-015 Acorn pivot shoe, for your 3000 & 3300 Series window. It seems the balance sizes don't match, because I have known them to use 5/8" thick tube tilt balance such as our S600-29 spiral balance with a blue tip. I encourage you to reconfirm those measurements and get back to us with that information if it should differ what we are mentioning to you.
A home owner from Fenton, Missouri says:
September 28, 2017
It is definitely 3/8" X 28 1/2". See photos.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
October 3, 2017
Thank you for the additional photos. I believe it would be best to go with our S900-29 spiral balance with green tip for a sash weight between 14-26 lbs. Take a look and let us know what you think.
Pivot Shoe, 17/32" Thick
Pivot Shoe, 17/32" Thick
15-015
$1.55
Spiral Balance Charging Tool for Tilt Windows
Spiral Balance Charging Tool for Tilt Windows
75-006
$9.97
Pivot Bar, 3"
Pivot Bar, 3"
26-040
$1.57
29" Series 900 Spiral Balance
29" Series 900 Spiral Balance
S900-29
$9.15
How to replace a tilt window spiral balance.
How to replace a tilt window spiral balance.
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