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My new header mounting flange measures 3/16" thinner than my Weber Canon intake manifold mounting flange. The stud mounted clamp that secures the two is cast with two ears each with a protruding contact button. Do I compensate the difference by grinding down the higher ear or by shimming the lower ear? Or does it matter? I don't have the old header I am replacing and don't remember how that one mounted. My clamps have not been modified and I don't remember shimming the old header.