I had the same creak. Changed the bushing, and the creak went away for a short period of time then it came back. Said to myself why after I changed the bushings. So I found out it was both the bushings and ball joints. So considering I had to buy the ball joints I bought the complete kit. Upper and lower arm, ball joints and a few other pieces. The rear end on my x is so stiff now. Exactly how I like it.

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01 apline white x5 4.4