Manufacturer: ‎ENA. Mount Type: Bolt On; 3. Spark plug: 1. Center Electrode Tip Material: Iridium; 2. Gap Size (IN): 0.043; 3. Hex Size (IN): 0.63; 4. Automotive Fit Type: ‎Vehicle Specific Fit. Item model number: ‎F150 F250 F350 F450 F550.