identify balance for IWC non-tilt window

A quick learner from bisbee az says:
I am looking for 2 replacement assemblies for an IWC vinyl non-tilt window.
The channel measures 9/16" and is 27" long.
It has markings in blue 26 4 DV CMC 7.
the string and pulley broke in one of the old ones.
pictures attached
thank you
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Thank you for posting. Start out by looking at our Series 351 channel balance, which comes with our 19-002 top and 15-002 bottom pre-attached. Just make sure these nylon attachments are the same size as yours.
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