25 YRS. GTS 4.0. Left.BASE. Lower cntrl arm adjust bolt. Rear. Right.BASE. STYLE. A circular device that has an offset hole to alow for Adjustment of alignment. A fastener used to secure a Control Arm. A threaded rod with a drive head (such as hex, 12 point, torx, etc) on one end used to secure the Camber Adjustment Cam to a mounting point. Cam Bolt.