Upgraded 5/8″ diameter U-bolts Stock Ford is 9/16″. For use in 1999 F250/F350/Excursion 4WD trucks with leaf springs. Includes new u-bolts, hardened flat washers, lock washers and new high strength nuts. Sold 2 u-bolts per kit, if you are replacing both sides, you will need 2 kits. Please note: These U-bolts only fit the 1999 4X4 F250/350 Super Duty trucks and Excursions with square top shape. They do not fit the 2000-2004 4X4 F250/350 Super Duty trucks and Excursions. Please contact us for more information.