Review on Dorman 521-583 Black Rear Upper Suspension Control Arm for Chevrolet, Pontiac, and Saturn Models by Austin Olson

Good quality part identical to the original which it replaced on my 07 Saturn Aura. The internal screws were accessible with a very creative use of extensions. If you don't have electric or pneumatic tools, it can be handy to have an assistant hold the wrench on the back. I found that the knock I was trying to fix was coming from the trailing arm. and when the oil disappears, you hear someone trying to escape from the trunk. :)