twin sash balance

A quick learner from San Francisco says:
i need 4 of these (window made by Mr Glass).
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Emily from SWISCO responded:

Hello there!

The part in your photos looks like our 15-102 double-side load carrier which is designed to use the Series 145 coil springs (sold separately). Look over the specifications and compare them with yours to see what you think.

If you have any questions just let us know!

A quick learner from San Francisco says:
Thanks!! Do I need two per window or one per window? two springs per assembly, correct? in other words, if I have two windows, I would need four assemblies and eight springs, correct?
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Emily from SWISCO responded:

Yes, that's correct! You can always refer to your windows existing set up to confirm as well. 

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