FYI the 1973 C-Body spindles are a one year only deal and tough to find ( and sometimes expensive) the 74-78 C-Body spindles will also work but you would need a sleeve in the upper ball joint as the later c-body uses a bigger taper. T fit the e-body lower ball joint with either spindle you simply slot the holes the correct amount. Besides raising the ball joint above center the other obvious benefit to c-body spindles is the bigger brake rotor.