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Have the shocks/struts ever been replaced? The rocking is normally caused by worn out shocks and/or sway bar bushings. When the shocks go, you normally will experience a rollercoaster type up and down motion when you hit bumps (the springs are bouncing and the shocks are not dampening/rebounding properly). If you do not have this up and down rocking, but just sideways, check your front and rear sway bar bushings for wear or damage to where they connect to the frame. If the mount has broken or come loose, it will not prevent the sideways sway. You should also see a sideways lean going around corners.
I don't think that there is a part on your car called the rocking arm. But there is set of bars in the front end called the sway bar. The sway bar helps the car handle correctly and it is critical. I am no expert so I would visit your local dealer or mechanic.
Try looking at the sway bar link on each side. If they move easily by hand then they likely need to be replaced. You can do a sort of self test by rocking the car up and down at the front fender tire well. If you can hear it clicking when you rock it, it is likely that sway bar link. Good luck!