Hardware SnapNrack Sealing Washer Lag 4.5" Stainless Steel, 242-02168 Mfr. Part # 242-02168 Size 4-1/2 In.
Direct Attachments SnapNrack Ultra Rail Wide Base Seam Clamp w/L-Foot & Lock, 242-05159 Mfr. Part # 242-05159