I claim the ornamental design for a fender and rollover guard, as shown and described.
FIG. 1 is a front perspective view of a right side fender and rollover guard mounted on an all-terrain vehicle, the left side guard being a mirror image and not shown;
FIG. 2 is a top plan view of the guard;
FIG. 3 is a right side elevational view of the guard;
FIG. 4 is a rear elevational view of the guard; and,
FIG. 5 is a front elevational view of the guard.
The dashed lines in FIG. 1 represent an all-terrain vehicle upon which the fender and rollover guard is mounted and do not form part of the claimed design.