Left. Outer wheelhouse stud. Right. A fastener which consists of a shaft and a head on one end, and when the shaft end is installed it expands and holds the Floor Pan Reinforcement in place. A fastener which secures the Body Cross Panel to it's mounting point. Wheelhouse Bolt. Body Panel. Closing plate. Floor Pan Reinforcement. Outer Wheelhouse stud. STUD - -. Wheelhouse Bolt. Included with: Floor rail, Outer Wheelhouse, Rear Panel.