Compatible with Ford 6.0 Powerstroke SET OF 8 Glow Plugs. Replaces part ZD13 / 4C3Z-12A342-AA. Built after 9/22/2003. As a direct replacement for your factory glow plugs, these units are designed and tested to the most stringent standards. This allows for faster start up while optimum temperatures are quickly reached. Features: Precision Engineered Reaches High Temps. Quickly For Fast Start-Up Superior Electrical Insulation High Thermal Conductivity