I'm in the same boat as my spare for the 4.6iS is missing. The dealer put a 17" standard in their and I never noticed for a year. A little late to go back. I've been starting to look for an option other than the factory since they are really expensive now.

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2003 X5 4.6is Estoril Blue
2005 Infiniti G35X
1972 Datsun 240Z
1991 Isuzu Impulse XS Sold
1972 Fiat 850 Spyder Donated
1972 Datsun 240Z Sold
1972 Datsun 510 Sold