625 ILCS 40/3-3

The Department shall issue to the snowmobile owner two registration expiration decals with the number awarded to that snowmobile imprinted upon the decals. The owner shall apply these decals on each side of the cowling of such snowmobile. The certificate of number shall be pocket size and shall be available at all times for inspection on the snowmobile for which issued, whenever such snowmobile is in operation.