The ornamental design for combined levelling mounting bracket and mounting plate, as shown and described.
FIG. 1 illustrates a rear perspective view of a combined levelling mounting bracket and mounting plate.
FIG. 2 illustrates a front perspective view thereof.
FIG. 3 illustrates a top view thereof.
FIG. 4 illustrates a front view thereof.
FIG. 5 illustrates a rear view thereof.
FIG. 6 illustrates a bottom view thereof.
FIG. 7 illustrates a right side view thereof; and,
FIG. 8 illustrates a left side view thereof.
The broken lines in the drawings illustrate portions of the combined levelling mounting bracket and mounting plate which form no part of the claimed design.