I apologize if i sound snarky, but you can search for the part to see if it fits a 2006 X5. Straight from the H&R site it lists this:
X5 E70 2007-09 Sport Spring w/ self-leveling 2.0 1.0 50435-2 $449.00
X5 E70 2010-up Sport Spring w/ self-leveling 2.0 1.0 50435-2 $449.00
Again, I have not installed these springs so i could not tell you more than whatʻs on the net. The previous owner bought these from H&R and that he used it on a 2008 X5. I would not be able to tell you much more than that.
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