FIG. 1 is a perspective view of a rearview mirror support bracket showing my new design;

FIG. 2 is a top, plan view thereof;

FIG. 3 is a bottom, plan view thereof;

FIG. 4 is a side, elevational view thereof;

FIG. 5 is a front, elevational view thereof; and

FIG. 6 is a rear, elevational view thereof.