Our IS300 RUCA features an alloy steel construction, and ON-CAR adjustable joints. This means to adjust your alignment, you do not need to unbolt anything from the car. The arms will help with performace and handling by getting rid of all rubber bushing joints, and also giving you more range to perfect your alignment.
These upper control arms are very nice. They are well made and the fit is perfect. The only issue I had was due to the location of the adjustments on these. I was forced to cut out a pretty significant portion of a spot welded body seam at the back of the inner fender. Also, some sort of instructions would have saved time and a little frustration as far as the adjustment, torque specs and maintenance recommendations. Installation is relatively straightforward and as I said previously, they fit perfectly. Ultimately, I got my rear alignment perfect. Thanks!