The ornamental design for the motorcycle rear seat arm rest assembly, as shown and described.
FIG. 1 is a front view of motorcycle rear seat arm rest assembly of our new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a right side elevational view thereof, the left side elevational view being a mirror image;
FIG. 4 is a right side elevational view thereof with the arm rests raised to their mount and dismount positions, the left side elevational view being a mirror image;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof; and,
FIG. 7 is an isometric view of a motorcycle rear seat arm rest assembly mounted on a motorcycle sissy bar.
The broken line showing of a motorcycle, sissy bar and backrest is for illustrative purposes only and forms no part of the claimed design.