The ornamental design for a holder for a peg board-mounted structure, as shown and described.
FIG. 1 is a top, right, isometric view of a holder for a peg board-mounted structure showing possible installation on a structure mounted to a peg board, both of which are shown in in broken lines;
FIG. 2 is a top plan view of the holder of FIG. 1 taken along arrows 2-2 in FIG. 1 showing a possible engaged position in a hole of a peg board, which is shown in broken lines;
FIG. 3 is a top, right isometric view of the holder of FIG. 2 showing a possible disengaged position;
FIG. 4 is a front, plan view of the holder of FIG. 3;
FIG. 5 is a top, plan view of the holder of FIG. 4;
FIG. 6 is a back, plan view of the holder of FIG. 5; and,
FIG. 7 is a right side view of the holder of FIG. 5, the left side view being a mirror image thereof.
Structures shown in broken lines such as a peg board (FIGS. 1 & 2), a peg board-mounted structure such as the hook shown in FIGS. 1 and 2, and exemplar fasteners for securing the peg board to a surface (FIG. 1) depicts environmental subject matter only and form no part of the claimed design. Arrows and nomenclature in FIG. 1 demarking the view shown in FIG. 2 form no part of the claimed design.