#1. 8 FOOT BED. Center c'member. PartQualifier: #1. Rear Center. A component to which the pickup box floor pan attaches to. A component which helps provide structural integrity to the pickup box floor pan sill. Supporting sheetmetal structure attached to the underside of the floor pan. BOX. Center c'member. Closure panel. Cross bar. Cup holder. Floor Extension. Intake hose. Mount c'member. Seat c'member. Suspension. Tail gate frame. Truck Bed Floor Sill Reinforcement. Vertical Support. Included with: Box assembly, Pick up box assembly.