Pella Hinge Shoe Pair

Looking for slide rollers (part name?) for Pella casement windows that are probably 30 years old. The windows are wood with a vinyl clad exterior. This part slides along with top and bottom window sash when you crank the window open. Any help is appreciated.

im a handyman looking to get replacement parts for a window that will crank open, but wont close without help. included is a picture of a broken portion that appears to have a part number on it. im afraid i only have assembled photos, and they are limited as well. if you need other photos please let ... (cont.)

This plate attaches to Pella pivot plate hinge shoe 39-363 or similar. The metal plate has a stud that drops into to a small plate on top of the window frame.

Flat plastic white teeth and roller at corner of window , top and buttom , where it slides in the window frame track, missing the white plastic part

708 cc windows. Doesn't quite look like some of the other parts mentioned in other responses as the full slider mechanism isn't connected to the spacer bar. I think the window is from the early 80s.