Needing Rh Exhaust Manifold

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Needing a RH exhaust manifold for my Dually. 350 engine, the manifold runs down below the spark plugs, the dump sweeps back at the end of the manifold, and the "extension" is very long, equivalent to having a heat riser on it, I'd say. But it does NOT use a heat riser. I have a 4X4 dually, just like it, and it uses the same manifold as 4X2. Actually needing the same manifold for BOTH trucks! If you have one that you can sell me, please let me know. Many Thanks