4WD. center. Part is included in sidemember assembly. Rail assembly includes, sidemember, cover plate, filler and threaded plate, retainer, bracket, bumper bracket, and welded nut. Reinforcement panel or structure used for the vehicles floor. Reinforcement panel used on the fender rail. Crossmember brace. Crossmember EXTENSION. Fender Rail Reinforcement. Floor pan crossbrace. Floor Pan Reinforcement. Floor REINFORCED. Front REINFORCED. Outer side panel reinforcement. Rail REINFORCED. Rear crossmember reinforcement. Rear frame. Rear panel. Rear plate. Rear REINFORCED. Rear support. REINFORCED plate. Retainer plate. Sill reinforcement.