ACCESS CAB. Rear sill mount bolt. W/O STEP SIDE. A Bolt used to attach the Truck Bed Floor Sill to its Mounting point. A Bolt used to attach the Truck Bed Floor to its Mounting point. A threaded rod with a drive head (such as hex, 12 point, torx, etc) on one end used to secure the Pickup Box to it's Mounting point. Part is one time use only. Body I. Inner Box Assembly. Sill.