Fitment Compatible with 2003 Excursion 6.0L Compatible with 2003 F250 6.0L Compatible with 2003 F350 6.0L Compatible with 2003 F450 6.0L Compatible with 2003 F550 6.0L Compatible with 2003 E250 6.0L Compatible with 2003 E350 6.0L Compatible with 2003 E450 6.0L Compatible with 2003 E250 6.0L Feature 1.100% Brand new aftermarket item. 2.Made of high quality of durable material. 3.Durability and reliability makes the engine run smoother. 4.Replacement glow plug harnesses part:3C3Z-12A690-AA, 3C3Z-12A690-BA, 3C3Z-12A342-AA, 12A690, ZD-12. 5.Easy to install Plug and play,easy to replace. Notes 1.We strongly suggest comparing the posted picture to your faulty/old unit! Please kindly check your vehicle's model and confirm this item is suitable for it before ordering. 2.The product does not contain installation instructions. If you have any questions about that, we kindly recommend you go to the nearby mechanic to ask for professional instructions. 3.Installation: Easy to install, assemble and remove with great convenience, direct replacement. Highly recommended installation by professional. 4.Color Difference: Due to the light and resolutions setting difference, the item's color may be slightly different from the pictures. 5.Please allow slight dimension difference due to different manual measurement.