Coil balance

A quick learner from Columbia, SC says:
Not sure which series to order as replacement and don't know where to find "3" on your site.
User submitted a photo of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
The photo shows two different springs. Both appear to match our 1/2" Series 160 coil spring. One is S160-6 and the other is S160-3. Check this hardware out and see what you think.
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