This Lakewood replacement U-bolt kit has 3/8 in. diameter and is 3-1/2 in. center to center.; 3/8 in. Diameter 3.5 in. center to center. Lakewood U-Bolts fit Lakewood traction bars and many other bars used on leaf spring cars. Kit includes high quality zinc-plated U-bolts with eight nuts and lock washers.;.