Exterior surface configuration of a motorcycle taillight assembly

FIG. 1 is a front view of an exterior surface configuration of a motorcycle taillight assembly, showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a perspective view of thereof; and,

FIG. 5 is a perspective view illustrating the present invention with the environment of the invention set forth in broken lines.

Features shown in broken lines depict the environment and do not form part of the claimed design.