I just dealt with this same issue b/c I bought dealer take-off 18's from an E70 to use as a snow set up on an E53 and got the answers in the thread below.
The E70 wheels have a slightly larger bore size than the wheels for the E53 so you will need hub centric rings to make them fit perfectly.
Doc from the Tire Rack wrote:
E70 74.1
E53 72.6
The difference is 1.5mm, so that's the thickness you will need for the hub centric rings to make the E70 rims fit your E53 hubs.
Here's the original thread, it started as a thread by jobaker4 about 18" wheel fitment on the 4.6 and 4.8, and then on page 2 it gets into your question. The name of the thread is: "18" rims will NOT fit on 4.8is"
Link:
http://www.xoutpost.com/tire-rack-tir...ight=bore+size