Broken coil spring.

A home owner from Escondido CA says:
October 4, 2018
My part or windows have markings except on spring has a 5z stamped on it. I need both left and right side. I think by looking at your site it is s-140-3? But not sure. Any assistance in identifying windows would help . Also any dealer locally so i can see parts on hand?
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Paul from SWISCO responded:
October 10, 2018

The "#5" you are referring to signifies the spring weight, so go with the S140-5 coil spring. 
5 lb Series 140 Quick-Tilt, Single
5 lb Series 140 Quick-Tilt, Single
S140-05
$7.49
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