Top and bottom guides

A quick learner from Westlake Village, CA says:
Just received S390-28 channel balances for 34 Lb windows. Need top and bottom guides. Can you identify the part? See photo
Thumbnail of the uploaded file named 87A309DC-6379-4F3C-932A-BD684D7F7B0C.jpeg
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Emily from SWISCO responded:

Hello!

This looks a lot like our 18-008 top sash guide. You'll need to remove yours and compare our dimensions to your original guide to see if this matches up for what you need.

Detail of 18-008
Detail of 18-008
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