The ornamental design for a multi-component retaining wall block, as shown and described.
FIG. 1 is a front perspective view of the multi-component retaining wall block of my design shown assembled and stacked on a second assembled multi-component retaining wall block;
FIG. 2 is a right-side elevation view thereof, the left-side elevation view being a mirror image thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a front elevation view thereof; and,
FIG. 6 is a rear elevation view thereof.
The broken line showing of another multi-component retaining wall block in FIG. 1 represents environmental structure, and all other broken lines in the views are included for the purpose of illustrating portions of the multi-component retaining wall block that form no part of the claimed design. None of the broken lines form a part of the claimed design.