Emission label. PartQualifier: w/CNG. PartQualifier: w/o CNG. w/o CNG. Caution Label. Emission Label. Engine Decal. Must supply vehicle VIN# with order. Part is ordered by vehicle number. VIN is required when ordering. VIN must be supplied to order. VIN must be supplied with order. VIN must be supplied with to order. VIN number must be supplied with order. VIN required to order. VIN# must be supplied with order. VEHICLE EMIS Control Info. Caution. Emission. Engine Decal. Engine Sticker.