Need this window part

A quick learner from NJ says:
This is keeping the window from staying up on its own. The window and copy of the part is attached.
Thumbnail of the uploaded file named 20220121_104230.jpg
Thumbnail of the uploaded file named 20220121_103629.jpg
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Paul from SWISCO responded:

Looks like you have the old Silverline 4000 Series window. The nylon pivot bar carrier looks like the 26-399 for the top sash. The pivot bar that is used with this is the 26-400 . The bottom sash pivot bar would be the 26-330 , which usually uses the 26-040 pivot bar. Compare dimensions to see what you think. 

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