Channel id, see photo's

A quick learner from Enid, Ok says:
June 10, 2017
I need to replace both channels on my window, appear to 9/16, and the only number is 2420, what do I need to order?
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
June 13, 2017
You may want to take a look at our S390-25 channel balance with a 2420 option. We believe this may be a good replacement for what you currently have.
25" Series 390 Channel Balance
25" Series 390 Channel Balance
S390-25
$10.55
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