uxcell Round U-Bolt 1 Set 0.87"(22mm) Inner Width 56mm Length Steel M8 with Nut, Plate: Amazon.com: Industrial & Scientific
Amazon.com: 4Pack Square U-Bolts 1-1/4"(30mm) Inner Width, 304 Stainless Steel U Bolts M8 with Washers & Nuts for Replacement Parts and Accessories for Ski Boat, Fishing Boat or Sailboat Trailer : Sports