Hinge on top of old Marvin window needs replacing

A home owner from St. Johnsbury, VT says:
The image is of a small "hinge" that is at the top of a Marvin window that is about 30 years old. On another window the hinge broke when the window was removed. Our contractor can't find a replacement through his usual sources.

This part is what keeps the window in a track so that the window can be swiveled open and shut. These windows have cranks that are used to open them.
User submitted a photo of window hardware.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
I'm afraid the black guides on hinges are not available by themselves. You would have to replace the whole hinge. Look at our 36-013-10 and see if this can work for you.
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