Silverline Window Coil Balance ID

A handy person from summit nj says:
double hung window.
I need to get the complete balancer assembly.
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Bob from SWISCO responded:

Thanks for writing in. This Pivot Shoe looks like it might be our 15-087. Look it over to see if it matches what you need. This pivot shoe uses our Series 180 Coil Springs. To know what spring weight you need, you'll need to remove the coil springs from the window and look for stamps on the coil tape. The stamp on the pivot shoe itself indicates you might need the S180-8 spring, which supports 8 lbs of weight individually, but these stamps on the pivot shoe are never as reliable as stamps on the spring tape themselves, so check these to be sure. If there are no stamps on the springs, or you are uncertain, give us the exact weight of your window sash, and we can work out what you need.

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