Trailer leaf spring kit for tandem 10k - 12k with 3" u-bolts 3" axle 5,200 / 6,000 each axle 4 @ 2900 lb springs u-bolt kit

10k - 12k Suspension Springs and u-bolt kit Includes 4 @ 2,900 lb - 5 - leaf springs  1 3/4" wide and 25 1/4"  eye to eye center Also known as 5,200 lb and 6,000 lb per axle Eye to eye springs include nylon bushing already installed. U-bolt kit includes 8 @ 3" x 7" inside diameter round u-bolts (9/16" ) and nuts 4  u-bolt axle plates *All items are new.*