27517. Mount bolt. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Steering Column Housing Support to it's mounting point. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Steering Column Housing to it's mounting point. Part included in Column assembly. Flange. Housing. Mount. Tilt bracket. Tube.