Hardware SnapNrack Sealing Washer Lag 4.5" Stainless Steel, 242-02168 Mfr. Part # 242-02168 Size 4-1/2 In.
Hardware Unirac MetalX Service Nut, ES10261 Mfr. Part # ES10261 Diameter 1.26 L x 0.49 W x 0.24 H In.