Mishimoto MMTS-F2D-03F Ford 6.0L Powerstroke Thermostat Housing, 2003-2007 Direct fit for the 20032007 Ford 6.0L Powerstroke Material: 6061 Aluminum / Note: This thermostat housing requires the use of the Ford Motorcraft RT-1169 thermostat. CNC-machined aluminum housing includes O-ring for a consistent leak-proof seal Direct-fit replacement for your aged factory unit Mishimoto Lifetime Warranty