replacement spring balance

A quick learner from California says:
Hi and thanks for your help.. I'm looking to replace some broken spring balancers out of my Milgard windows. The number on the balancer is.. 26 4 kn caldwell.. it is 27 inches long.. which one of your product will work for me??


User submitted image of their window hardware.
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Tom from SWISCO responded:
Hey, Craig. I recommend looking at our S385-27 channel balance with a 2640 option. I think this could work for you, but see what you think.
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