Need to replace operators on 2 casement windows

I am looking to replace both of the operators on my casement windows. One the gear units has completely strip and the other, I am sure, will be right behind it. The brand is Entry Guard. On the major arm there is a number 40754, on the minor 31538A, there is a 3rd number 20810A. On the base of the gears 45179. All are visible in the photos attached. The arm goes into the track by the use of a nylon bushing. I need a left and a right and I am not opposed to changing the track if you offer a better solution. The arm sometimes pops out of the track. I would like to have a turn key option to replace the left and right operators on my windows.

Mike