Missing part?

A quick learner from Stratford, NJ says:
Hello, I'm looking for the part in the picture attached that I have wrote 'missing' on. Seems like they are the friction parts. The windows that do not have there will not stay up. I need four of them.
Thank You
Michael
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Bob from SWISCO responded:

Hey Michael. See our 18-065 or 18-089 Metal Top Sash Guides. Could you need one of these? Take a look and see what you think. 

How to Replace a Top Sash Guide [1080p]
How to Replace a Top Sash Guide [1080p]
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