The ornamental design for a side portion of a motorcycle rocker box, as shown and described.
FIG. 1 is a side view of a side portion of a motorcycle rocker box embodying the present invention; and,
FIG. 2 is an enlarged side view of the side portion of a motorcycle rocker box of FIG. 1.
The present application is directed to the design illustrated in the drawings. The other features of the drawings, such as the motorcycle shown in FIG. 1, are not considered part of the design sought to be patented, and have accordingly been shown in broken lines.
The design sought to be patented is not visible in the front, rear, top, bottom and left side views. Accordingly, these views have been omitted.