FIG. 1 is a front view of a vehicle window panel showing our new design: FIG. 2 is a rear view thereof; FIG. 3 is a right side view thereof; FIG. 4 is a left side view thereof; FIG. 5 is a top (plan) view thereof; FIG. 6 is a bottom view thereof; and, FIG. 7 is a perspective view thereof.