4PCS Spark Plug Port 14mm Insert For Ford Triton Motor 5.4L Two Valve Engines Please check your part number or photos before purchasing. (Note: Weekend message will be replied on the next working day) Specifications: Inside Diameter: 14 x 1.25mm Outside Diameter: 0.75 -16 Replace Part Number: 389-100 389100 Fitment: For use on 4.6L, 5.4L and 6.8 V-10 Ford Triton Two Valve Engines For use on years 1996 to 2003. Part No. 389-100 Replacement Inserts Used With: Cal Van 38900 Set Insert size: m14-1.25 Professional Installation Is Highly Recommended. Package Include： 4x Spark Plug Port Insert as picture show.