Mahle Original, Ford 6.4L Exhaust Rocker Arm. Need exhaust rocker arm that is guaranteed to fit your 6.4 Powerstroke 2008-2010 model? Look no further than Mahle's 214-2203 exhaust rocker arm! This Part is an OE direct fit replacement. This rocker arm has been precision laser cut to ensure a perfect fit and exceeds OE tolerances. It also features a phosphate coating to prevent rust and corrosion.