Your X5 weighs in excess of 5000lbs, so it's near impossible for you to sit/stand there and pull on it and be able to get even close to reproducing the forces applied to the suspension components. It's easier to just replace the whole arm instead of cutting corners by replacing just the bushings and assuming the ball joints are fine.

I wouldn't think the rotors are an issue since I'd imagine that you'd feel a vibration from there while driving in general as well if they're warped that badly.

Lastly, a lot of people don't do the suspension installations incorrectly and then automatically blame it on crappy parts...FCP stuff seems to get the biggest complaints, but it can happen to ALL brands. When doing the final assembly of suspension components, tight down the nuts/bolts till they're snug, put the vehicle back down on the ground so the suspension is compressed under the weight of the vehicle...on blocks, drive up ramps, whatever...then do the final torquing of the nuts/bolts. When people tighten everything down w/ the vehicle in the air and the suspension still drooped down, they're essentially pre loading the pieces in the wrong position and will cause a very premature failure.

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