Ah, well, see....
When you drive the car, the wheel spins. It is attached through a round thing, called a bearing, to a rigid object called a spindle or a knuckle. The spindle has to be able to move up and down to allow for bumps in the road and if it's a front wheel (or rear wheel with 4 wheel steering) it has to be able to turn for steering.
The spindle is attached to the vehicle in at least three points to hold it steady. An upper control arm attaches to the spindle at the top of the spindle and keeps if from moving in a left/right direction. On some (but not all) vehicles it can also keep it from moving forward/backward and can push the spindle down and car up. It is usually attached to the spindle via a ball joint.
You change the control arms, upper and lower. The ball joints are manufactured into the control arms.
The Chrysler control arms are components of your suspension system which consist of the lower control arm and the upper control arm. The number of control arms depends on the type of your auto.
No arms it uses struts.
On upper control arms there are two bolts that secure control arm to vehicle. There will be shims between vehicle and control arms, add or remove shims to make adjutment.
rash on upper back arms
They would be connected to two control arms, one upper control arm and one lower control arm.
near the front wheels on the upper and lower control arms
The upper arm is part of an arm and therefore there are no complete arms in the upper arm.
You can replace just the ball joints on the lower control arms , but the upper ball joints come with a new control arm
What vehicle, there are many different types of front ends in different cars
The ball joints are riveted or pressed into the upper and lower control arms, then the spindle is bolted to the ball joints.
Arms