There are a few sources for them. The below is pretty popular- nice kit that is easy to install:
COOLANT FILTRATION SYSTEMS
Mark
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2004 White F350 XLT, CC, SB, 4x4, 6.0L Auto, 3.73LS, Camper Pkg, Skid Pkg, Edge 2" Mini Spring Pack, Bilsteins, MBRP Exhaust, FluidAmpr, Elite Regulated Return (55 psi), Airdog, Weld Evo Velociti & LT285/75-16
Built: 11/03/03
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