2017-20. Mount bolt. Rear. A Bolt used to attach the Truck Bed Floor Sill 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. Body Mount Cushion Bolt. Part cannot be reused/reinstalled. Floor Sill. Body Cushion.