Inner uniside nut plate. Left.CREW CAB. Right.CREW CAB. A Nut used to retain the Floor Pan Reinforcement to it's mounting point. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Aperture Panel. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the B Pillar Reinforcement. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the B Pillar. Interior Grab Bar Nut. Body B - Reinforcement. Center REINFORCED. Floor Pan Reinforcement. Inner aper. Interior Grab Bar. Sill. Uniside. Included with: Floor Pan assembly, Inner Aperture Panel, Inner center Pillar, Inner Panel assembly, Inner Uniside.