Yes those are the tension bushing. Have him check the balljoints that the tension arm connects to also. I hope he is familiar with BMW, once installed u must leave the bushings bolts loose until the car is loaded on it's tires. Push down on the car and then tighten those bolts. Otherwise the bushings will twist and continue to shimmy upon braking from 50-60

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2001 X5 4.4i WHITE-Loaded like a baby's diaper SOLD