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They have the bracket cast into the housing because the housing comes of an escort and the wastegate on a 4x4 manifold is further round then on a 2wd one, hence on a 2wd the cast bracket is redundant as the original 2wd bracket has to be bolted back on in the original position. Mine is a t34 but it uses the standard t3 housing which is machined on the inside to take a t34 compressor wheel.