These are DK brand gaskets that we have been developing for years to provide a quality product without relying on other manufacturers. We have eliminated the middleman and deal directly with the manufacturer, where we can modify, enhance, and produce the quality the end user desires. This gasket set allows the freedom of the purchaser to choose the head gasket they desire. Special Notes about the Product(s): 2 x Multi-Layer Steel Head Gasket with Dowel Pins for proper cylinder head alignment 2. This product listing fits the following application(s): Fits Ford 6.0L Powerstroke Engines (18mm or 20mm) 363 CID (6.0L) 32V Turbo V8 International Powerstroke Diesel Interchange Part Number(s): 54450A, 54579A KC3Z-6051-A, KC3Z6051A, KC3Z-6051-B, KC3Z6051B, HS54550, HS54579, 95-3747, 95-3747VR, KC3Z-6079-CA