Replace 2 balancers from Milgard window.

A home owner from Seattle WA says:
21 inch balancers, metal channel only measured. From a Milgard window circa 1992 I believe.
Balancer marking was: 20 4 JK Caldwell.
User submitted image of their window hardware.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting, based on your pictures we recommend S385-21 with a 2040 option.
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