The ornamental design for a rearwing for a vehicle, as shown and described.
FIG. 1 is a front left elevated perspective view of a rear wing for a vehicle according to the present invention.
FIG. 2 is a front left perspective view thereof.
FIG. 3 is a rear right elevated perspective view thereof.
FIG. 4 is a rear right perspective view thereof.
FIG. 5 is a front view thereof.
FIG. 6 is a rear view thereof.
FIG. 7 is a left side view thereof.
FIG. 8 is a right side view thereof.
FIG. 9 is a top view thereof.
FIG. 10 is a bottom view thereof; and,
FIG. 11 is a top view of the rear wing shown in FIGS. 1-10, but with the rear wing mounted on a vehicle, and the rest of the vehicle shown in de-emphasized and half-tone portions to illustrate environmental structure. These portions form no part of the claimed invention. More specifically, in FIG. 11, the inventive rear wing is shown within the broken line, and the elements shown outside the broken line form no part of the claimed invention, but are included to show environmental aspects thereof.