The mount point of the shoulder harness would be the crossbar behind the driver's seat, at a point below the shoulders--don't remember the exact spec on it right off.... This way the shoulder belts hold you back in the seat, and not pull down too much or let you slide out of the seat if there's an impact.... Believe me, when there's an impact you do move around a bunch in the seat even with a 5 or 6 point harness!!!!!