What year X5/X6 were you referring to? The BMW X5 and X6 wheels are actually a bit funky to be honest. BMW had designed various hub sizes for specific years/trim levels.
X5 E53 - 72.6 center bore
X5 E70 - 74.1 center bore
X5M E70 - 72.6 front/74.1 rear center bore
X6 E71/72 and M - 74.1 front/74.1 rear center bore
-Charles@VMRWheels
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