I'm looking at purchasing Alpina wheels for my not yet arrived e9 - 8Jx16 offset 24 for the rears, and 7Jx16 offset 11 for the front. Can I use an Alpina wheel 7Jx16 offset 11 as a spare? Will it fit on the rears? Will it fit in the trunk and not sit too high for the cover? Thanks. Jeff