To be clear in this thread, we are talking about Hehr Standard Windows. Smaller 1958
trailers used them all around the trailer, but most 1958 trailers used them on the sides only. Hehr Clearview windows were used on the front and back starting in 1958 (on the larger trailers).
As has been confirmed, Hehr Clearview window operators do not work on Hehr Standard windows. They only work on Hehr Clearview windows (common but not ubiquitous in 1958 to 1960
The little rollers on either side of the arm tip can always be replaced with the nylon friction slider setup.
The track you are showing is officially called a Front Frame Channel. It is extruded and no reproductions are available.
I know many people would like an alternative to the 7-11/16" cranks we currently sell but I can speak with great personal experience when I say they are not available from any source new. All problem solving ideas are welcome on this one.