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We made up the 3/16-inch difference between the back of the booster and the center of the hole in the pushrod by cutting and drilling a 3/16-inch aluminum plate to fit. This measurement is important, because too short of a rod and you won't get the full travel from the brake pedal, while too long of a rod means that the brakes will always be partially applied. We then put weatherstripping on it to keep the hot engine-compartment air out of the cab.