Balancer selection, no color tip

A quick learner from San Jose says:
August 29, 2019
Need to replace balancers for a 30"h x 34"w, 24 lb single hung tilt window (dual pane). Existing balancer is 3/8" diameter with 28" outer tube, no color tip. I'm guessing S900-28. Please confirm and recommend color.
A quick learner from San Jose says:
September 3, 2019
photos attached.
24 lb above was from putting window sash on bath scale
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Casey from SWISCO responded:
September 4, 2019

Thanks for the photos. Your balance does look like the S900-28. You just want to confirm the tube diameter of your balance is 3/8". If it is then, you should be ok to go. For a window sash of 24 lbs., you can go with the green colored tip. Take one more look at everything and let us know if any other questions come up. 
28" Series 900 Spiral Balance
28" Series 900 Spiral Balance
S900-28
$9.10
How to replace a tilt window spiral balance.
How to replace a tilt window spiral balance.
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