The ornamental design for a mountingbracket and supportarm for an exteriorvehiclemirrorassembly, as shown and described.
FIG. 1 is a rear perspective view of the mounting bracket and support arm design;
FIG. 2 is a front perspective view of the mounting bracket and support arm design;
FIG. 3 is a front elevation view of the mounting bracket and support arm design;
FIG. 4 is a rear elevation view of the mounting bracket and support arm design;
FIG. 5 is a right side elevation view of the mounting bracket and support arm design;
FIG. 6 is a left side elevation view of the mounting bracket and support arm design;
FIG. 7 is a top plan view of the mounting bracket and support arm design; and,
FIG. 8 is a bottom plan view of the mounting bracket and support arm design.
In the drawings, the broken lines depict a portion of a support arm and the interior boundary of a mounting bracket and support arm for exterior vehicle mirror assembly and form no part of the claimed design.