Spiral balance replacement for double hung vinyl window

A home owner from Peachtree city Ga says:
I have ordered two 26-125 sash pivot bars and need replacement balance springs. I am replacing 35 inch "vinyl" tubes approx 5/8" diameter. Window sashes approx 35" tall by 33" wide, approx 20-25 lbs. No colors on current spring assemblies. Unsure what series to order
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Tom from SWISCO responded:
If this is a tilt window, and if the tube diameter is 5/8", I'd recommend the Series 600 spiral balance.
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