The ornamental design for a side mount lightfixture, as shown and described.
FIG. 1 is a top perspective view of a side mount light fixture.
FIG. 2 is a bottom perspective view of the side mount light fixture of FIG. 1.
FIG. 3 is a right side view of the side mount light fixture of FIG. 1.
FIG. 4 is a front view of the side mount light fixture of FIG. 1.
FIG. 5 is a left side view of the side mount light fixture of FIG. 1.
FIG. 6 is a rear view of the side mount light fixture of FIG. 1.
FIG. 7 is a top view of the side mount light fixture of FIG. 1; and,
FIG. 8 is a bottom view of the side mount light fixture of FIG. 1.
The details shown in broken lines are for illustrative purposes only and form no part of the claimed design. The dash-dot-dot-dash broken lines represent boundaries of unclaimed portions of the claimed design and form no part of the claimed design.