Systems and kits for regulating the flow of material other than grain through common concaves while simultaneously equalizing the flow of grain through common concaves

A kit comprising:

• a) one or more concaves, wherein the concave is configured to be placed within a combine harvester around a rotor positioned within the combine harvester;
• b) one or more pairs of left-hand and right-hand cover plates;
• c) one or more pairs of left-hand and right-hand quarter-wrap MOG limiters;
• d) one or more over-center latches, wherein the over-center latches are toggleable between a locked and an unlocked position when in use with either of the cover plates or the MOG limiters;
• e) one or more linchpins;
• and
• f) one or more wire lock clevis pins.