Caldwell Channel replacement

A quick learner from Washington State says:
I need help choosing the correct channel balance. I have double hung non-tilting vinyl windows.
Marking on the channel balance reads"Caldwell". The length of the channel is 26 inches.
Do these come as a pair, or do I order them separately?
Thank you
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting! I recommend you look at our S385-26 channel balance. This appears to be a close match.
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