We claim the ornamental design for a rear bumper for a model vehicle, as shown and described.
FIG. 1 is a perspective view of a rear bumper for a model vehicle taken from the front, top and right side;
FIG. 2 is a perspective view thereof taken from the front, bottom and right side;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a right side elevation view thereof;
FIG. 7 is a perspective view thereof taken from the rear, bottom, and right side;
FIG. 8 is a perspective view thereof taken from the rear, top, and right side; and,
FIG. 9 is a rear elevation view thereof.
The appearance of the left side of the rear bumper for a model vehicle is a mirror image of the right side of the rear bumper for a model vehicle. The portions of the figures presented in dotted lines show environmental structure that forms no part of the claimed design.