FIG. 1 is a perspective view of our new design for a runner extrusion for a compactus assembly; FIG. 2 is a front elevational view thereof; the rear elevational view thereof being identical to said front elevational view; FIG. 3 is a right side elevational view thereof; the left side elevational view thereof being identical to said right side elevational view; FIG. 4 is a top elevational view thereof; and, FIG. 5 is a bottom elevational view thereof.