Chrysler originally made two versions of their center dump exhaust manifolds that were widely used on big block trucks and motorhomes. An early version, which was much thinner, lighter and subject to cracking. And this later version (factory originals had part number 3769103 cast into them), which they made much thicker and heavier to solve the cracking issues. We now offer a BRAND NEW reproduction of the 3769103 manifolds. Since they are brand new, you know the flanges will be straight and not warped, and there won't be any cracks, broken ears, and all the other problems that the used factory originals suffer from. These are great as service replacement pieces, or for engine swaps where a center dump style of manifold is required. This includes ONE per part number, so order a quantity of 2 if you need both sides. Don't forget gaskets also!