Ricky Bobby (said with a sweeet french accent), I think you just answered my question, by mistake.
I'm looking for the bolt diameter and not length, but you said it was a 14x1.5 and I believe alll other cars are just a 12x1.5, so yes the X5 bolt is fatter than the other BImmer models

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S