FIG. 1 is a perspective illustration, from the rear and left side, of elements of a side fairing for a snowmobile according to my design;

FIG. 2 is a left side elevation view thereof, the right side view being unornamental;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a rear elevation view thereof; and,

FIG. 6 is a front elevation view thereof.

In FIGS. 1-6, broken lines showing structure are for illustrative purposes only and form no part of the claimed design.