Small ball joint vs big ball joint

ALL Lower control arms are the same thing from 1962-1976.
The only difference is if you have a sway bar, then tabs are welded on for 1965-72 sway bars, and then 1973-76 sway bars.
Ball joints bolt to the spindle, (knuckle) and the ball joint stud goes thru the lower control arm.
Spindles are different for 9 inch drum brakes, 10 inch drum brakes, 65-72 KH disc brakes, 73-76 drum brakes, 73-76 disc brakes.