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The initial test-fit of the main hoop proved that it was right on the money after a minor trim to the bottom edges for final height adjustment atop the 1/8-inch mild-steel floor bracing plates. Be sure the hoop is equal and well balanced from left to right, especially when seen through the outside windows. Note that as a unibody car, the Road Runner's attachment points are on the body, since there is no frame. A full-framed car such as a Chevelle requires that the rollbar's attachment points be made to the frame.