Aperture assy rivet. Left.4x8. Right.4x8. 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 Uniside in place. A fastener which secures the A Pillar Reinforcement to it's mounting point. A fastener which secures the Quarter Panel to it's mounting point. A fastener which secures the Roof Panel to it's mounting point. A Rivet used to attach the Body B-Pillar and Rocker Panel to it's mounting point. Rocker Panel attaching Rivet. noye. Aperture Assembly. Body A - Reinforcement. Body B - and. Quarter. Roof. Uniside.