Alcoa spiral balance with a white tip

A home owner from Indiana says:

I need a replacement spiral balances for an Alcoa tilt window. It has a 3/8"x30" plastic tube. The actual metal spiral piece is 31" and the tip is white (as seen in the picture.) Can you help me find the right replacements? Thank you in advance for your help!
User submitted photo of their Alcoa window spiral balance with a white tip.
Profile picture of Paul
Paul from SWISCO responded:
Are you sure the balance tube is 3/8" and not 5/8" in diameter? Alcoa used Series 600 (5/8" diameter) tilt balances. As far as the balance tip- I would recommend moving up to a red tip, since your balance is 30" in length.

If you can, please double-check the diameter measurement.
A home owner says:
I double checked the diameter, I'm sure it is 3/8". Please see photo's
User submitted photo balance tube.
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