These lower arms can be used on any 4 link setup. They work especially well on crew cab trucks. They run a 1" uniball on the front and an 1.25" heim on the rear of the arms. Sold as a pair. Powder coated black. Same arms used in our daily driver link kit. CAD design. Fully internally ribbed and gusseted. Laser cut and CNC bent. Mig welded.