These 304 stainless steel U-bolt saddle plates, compatible with the Dana 70 axle (3.5" diam tube) and 2.5" wide leaf spring, come in a pair and are 1/4" thick.

They allow for an easy upgrade to 5/8" u-bolts and help prevent them from sliding towards the center bolt, while also evenly distributing the clamp load across the spring. The plates are designed with two center bolt holes - one centered and one 1" towards the front - as shown in the image when using an axle relocation block.