Please help me identify window channel balance

A quick learner from sacramento says:
This channel balance is for a non-tilt window. It is 1/2 inch in width and 28 inches in length. It says 27 4 HO Caldwell.

Thanks Donny
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Please see our Series 350 channel balance. I think this may be the hardware you want. Let me know what you think.
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