I claim the ornamental design for exterior track assembly having slidably adjustable mounts for decorative lights, as shown and described.
FIG. 1 is a perspective view of an exterior track assembly having slidably adjustable mounts for decorative lights embodying the design of the present invention.
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof, the right side elevational view being a mirror image thereof; and,