Need replacement Channel Balances for a non tilt window

A quick learner from Arizona says:
I need a Channel Balance for a non tilt window. It is 1/2" Wide & 34" long excluding the plastic ends. It has 33 4 KO CALDWELL stamped on it.
User submitted photos of a window balance.
Profile picture of Casey
Casey from SWISCO responded:
Thanks for your interest in SWISCO. Based on the measurements of your bottom balance shoe will determine whether you will go with our Series 351 or Series 390 channel balance. I recommend measuring as carefully as possible. Get back to us if you should need any further help.
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