Today I bought all tools that needed to replace control arm, then started to work. After I jacked up my car, took off the wheel and started to unscrew the nut that connects to sub-frame, I found that the screw was not 18mm, which is said in the instruction in the home page, I found that the screw was 16mm. Since I did not buy 16mm socket, so what I had to do was to put the wheel back on and lower the car. I will go out to buy 16mm socket tomorrow, and re-start the work. It really sucks.

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--2004 E53 X5 4.8is - ECE version; right hand drive; Located in Hong Kong; ext. black sapphire metallic; int. leather black; adaptive dynamic bi-xenon headlights; 16:9 onboard monitor w/o navigation; 20" genuine BMW Y-spoke 214 wheels with Bridgestone Dueler H/P Sport tires; Int. rear view mirror w/ compass.