FIG. 1 is a perspective view of an interlink of the claimed design. FIG. 2 is a front elevational view of the interlink, the rear elevational view being identical. FIG. 3 is a top plan view of the interlink. FIG. 4 is a bottom plan view of the interlink; and, FIG. 5 is a right side elevational view of the interlink, the left side elevational view being identical.