Hey guys new to this forum and new to x5

I tried using search button but no luck

ok here we go

i recently bought a 2009 my10 bmw x5 e70 xdrive35d
love the car

it came with 18” wheels which look so small so i took my wifes old x6
wheels and had the rears machined to suit the hub the problem is the 315 tyres are hitting inside and wont fit??? my friend has the same car x5 and he has the identical wheels and 315 and fit ? any ideas?