The ornamental design for a custom-sized vehicle fender cover, as shown and described.
FIG. 1 is a perspective view of custom-sized vehicle fender cover shown in its environmental use;
FIG. 2 is a top plan view of FIG. 1;
FIG. 3 is a left side elevational view of FIG. 1;
FIG. 4 is a front elevational view of FIG. 1; and,
FIG. 5 is a top plan view of custom-sized vehicle fender cover showing the one-piece aspect of my new design, in a flat condition, and not in its environmental use.
In the drawings, the broken lines depict a vehicle that forms no part of the claimed design.