Desmoparts stocks this OEM Racor diesel fuel filter for your Duramax 6.6L engine. Racor is the OEM for the GMC / Chevrolet Duramax filter that AC Delco sells. We also carry the Baldwin Air and Lube filters for your Duramax vehicle as well. Filter includes necessary O-rings sealed inside the plastic bag. Filter meets OEM specifications (it is the OEM) and is of the highest quality depth coalescer media type replacing all other previous generations of this filter. This is the latest updated new filer as of November 2009 as specified by GM. It replaces the old PFF5544 dual element water absorbing type. Fuel filter will fit all GMC and Chevrolet Duramax 6.6L diesel engine vehicles (not Van) from 2001 through 2013. Replaces GMC part number 89016324, 97256734, 97385488, and Isuzu 8-97385-488-0.