FIG. 1 is a left front perspective view of a side panel for a snowmobile showing our new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken line showings are for illustrative purposes only and form no part of the claimed design.