replacement coil balance springs

A quick learner from Fernandina Beach says:
Windows have dual coil balance springs on each side of window.
Upper coil spring is labeled 440 and lower coil spring is labeled 540
Width of spring is 1/2 inch
Weight of window is 23.4 pounds
Springs are 25 years old.
All other parts work properly, tilt window shoe locks etc.
Springs are held to shoe locks by part 33-073 screw.

Which coil springs do I need to order?
Concern is the 440 S190 and 540 S190 springs appear to be 1 inch wide versus the slot just fitting a 1/2 inch wide spring.

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Paul from SWISCO responded:
Hello there! It sounds like you need both our S190-440 and S190-540 coil springs. I have also placed a list on the upper right hand side of this page of the related items that would go with the coil springs. Look over the list for any additional items you may need.
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