FIG. 1 is perspective illustration, from the front and left side, of a side panel for a snowmobile according to our design;

FIG. 2 is a left side view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

Throughout the Figures, broken lines showing structure are for illustrative purposes only and form no part of the claimed design.