Amazon.com: New Trailer U Bolt Kit, Trailer Leaf Spring U Bolts, for 5200-7000lbs 3" Round Axle, 7” Long U-Bolts, 1/2” Diameter, 3” Wide U Bolts-20080 : Automotive
U-Bolt Kit for Mounting 3,500-lb, Round Trailer Axles - 5-1/2" Long U-Bolts Redline Trailer Leaf Spring Suspension APUBR-1