This is an aftermarket glow plug set that replaces the OEM glow plugs on the 6.4LPowerstroke. Our parts will meet or exceed the specifications and productivity of genuine parts. All parts come with a minimum of a 1-year warranty. If a problem occurs at the fault of the parts, we will replace the parts at no charge to the customer. This kit contains: 8 Premium Glow Plugs This kit fits Ford engines with: VIN Code 'R (2008-2010) and 391 CID (6.4L) 32V Turbo V8 International Power-Stroke Diesel Interchange Part Numbers: Ford - 8C3Z-12A342-A or ZD-15 Bosch - 0250212008