NEW FUEL PRESSURE REGULATOR FOR GM DURAMAX 2004 1/2 thru 2005 LLY MOTORS. CALLED A MEASURING UNIT OR MPROP BY BOSCH THIS FITS LLY ENGINES EIGHT DIDGIT IN VIN CODE IS 2. THIS UNITS INSTALLS IN THE CP3 HI PRESSURE PUMP. BOSCH IS THE OEM SUPPLIER TO GM FOR THE HI PRESSURE PUMP AND THE REGULATOR.