Glad you tightened them up. Replacing those bolts is a question of debate here. The fact that no BMW dealer stocks them, from the ~6 I've contacted shows me the service departments aren't replacing them every time they work on an X. If they did replace them every time, they would keep a bunch in stock. Price is crazy expensive from the dealer now. I suspect properly tightening the ones you have is all you need.

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David.X5
2001 X5 4.4i Sport
SOLD! at 160k miles