There are four vents on the bottom rail of each sliding window on a toyota chinook. The original plastic vents were super fragile, so this is the replacement i made.

I made a single model and a tray that can be printed to replace all 8. ABS plastic, or something more UV stable would be best for these as they most likely would be considered a consumable. I will be creating a version of these that do not vent, so if you are in a dusty or cold environment they can be swapped or popped out.