Originally Posted by TomTarzian
My dealer tried the space saver available from LeatherZ. Even with a 15mm spacer it won't fit--the E9X M3's front brakes are too big. Then, of course, there is the diameter issue.
My dealer will soon be trying the space saver from an X3/550i with the 15mm spacer. It's a bit larger in diameter and has different offset.
According to this (http://www.realoem.com/bmw/showparts...18&hg=36&fg=10
) the X3 wheel is 4x17 et18 (haven't found tire size; the E46 version was 3.5x17 et30 w/ 125/80 tires. Let us know if you get further info.