Balance replacement

A handy person from Pennsylvania says:
I currently have a tilt window with 2 5/8" red tip spiral balances. The tube on the left side split wide, so they need to be replaced. I assume the previous owner of my home was to blame, because this type of damage doesn't happen over time. I was wondering if it were possible to replace the 2 spiral balance tubes with 2 of these Series 870 Arrow Balances.

If not, I'll just order another set of red tip spiral balances and call it a day.
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Paul from SWISCO responded:
I do not recommend trying to use our S870-26. There are too many things that could go wrong. If the manufacturer used the Series 600 balance, then that's what I would stick with.
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