Looking at the upper control arm from beneath the vehicle reveals that it’s mostly black. The ball-joint area was left natural to prevent paint from flowing into the joint, compromising its ability to move freely. Today we commonly see the cotter pin—which prevents the steering knuckle retaining nut from backing off during normal use—folded back over the nut. The factory used another crimping method, which left behind 90-degree angles and a much cleaner look. This process likely consisted of driving the pin over the nut using a slightly oversized socket and a hammer. Note the orange paint marking on the steering knuckle at the right of the photo. It likely denotes finished installation of that component.