I have a set of Zinc plated Ubolts (Wild Horse 4x4 extreme duty ubolt kit), 3.25" between the U (made for a 3" axle tube I think) and 8.5" between the top of the threads and the U. Come with correct thick washers and nuts. 5/8" leaf plates included. Never ran them, mocked up under the truck for a while then got a different axle.
http://www.wildhorses4x4.com/product...o_Leaf_Springs
$50
http://www.wildhorses4x4.com/product...o_Leaf_Springs
$50