The ornamental design for a bumper side panel, as shown and described.
FIG. 1 is; a front top perspective view of the bumper side panel of the
present invention; FIG. 2 is; a reduced front top perspective view
thereof; FIG. 3 is; is a top plan view thereof; FIG. 4 is; a front
elevational view thereof; FIG. 5 is; a bottom plan view thereof; FIG. 6
is; a left end elevational view thereof; FIG. 7 is; a right end
elevational view thereof; and, FIG. 8 is; a rear elevational view thereof.
The fragmentary, broken line representation of the right end of a truck
bumper in FIG. 2 is for purposes of illustration only and forms no part of
the claimed design. FIGS. 3-8 are shown enlarged for ease of disclosure.