Non tilt window balance

A quick learner from Seattle WA says:
I need a window balance for a non tilt window.
Currently have a Vision One p/n stamped 20-3
it is 21" long channel with top and bottom pieces that adds 1"
Channel width 1/2"
Bottom piece has a number on plastic 15-P102 3
Top piece has no number, looks like your 19-005

Can you help?
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Tom from SWISCO responded:
You've identified the top attachment, which helps, but I'm not sure about the bottom. We have a couple different Series that may work. You will need to carefully compare our pictures and measurements to your own to confirm the best match.
A quick learner from Seattle says:
I think I figured the right bottom piece and ordered 2 units.
We will see how good I am when they get here.
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