The ornamental design for a headlight for a vehicle, as shown and described.
FIG. 1 is a front perspective view of a headlight for a vehicle showing my new design, the headlight for a vehicle installed in an exemplary snowmobile that is not being claimed;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a left elevation view thereof (the right elevation view is substantially similar to, or the same as, the right elevation view);
FIG. 4 is a top plan view thereof;
FIG. 5 is a front perspective view of the headlight for a vehicle apart from the exemplary snowmobile;
FIG. 6 is a front elevation view of the headlight for a vehicle apart from the exemplary snowmobile;
FIG. 7 is a left elevation view of the headlight for a vehicle apart from the exemplary snowmobile (the right elevation view is substantially similar to, or the same as, the right elevation view); and,
FIG. 8 is a top plan view of the headlight for a vehicle apart from the exemplary snowmobile.
Any broken lines in the figures are directed to environment and are for illustrative purposes only. The broken lines form no part of the claimed design.