Channel Balance

A quick learner from USA says:
This is related to the below order. My contractor thinks I'm missing this part. Can you identify this for me? I ordered S38-31 Option 3030 and would like to know if there s any other hardware I would need to put this balance in its place? Please see attached for further review
User submitted a photo of window hardware.
Profile picture of Tom
Tom from SWISCO responded:
Thank you for your post! Your photos are showing the top sash guides, which is our product 18-124P. Please let us know how you make out with that.
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