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Though it looks as if it's riveted to the boxing panels, the Chassis Engineering X-member actually bolts to the framerail flanges. To do that, Dave first trimmed the ends off the X-member legs and plated them with panels that fit flush against the boxing plate. He flanged the top and bottom of each plate with 1/2-inch-thick flat stock that protrudes into slots cut in the boxing panels by 2 inches, or roughly the depth of the framerail's flange. Two 7/16-inch threaded holes in each plate correspond with 16 countersunk holes in the upper and lower framerail flanges.