Alright, i'll finally post my specs because been getting asked a bunch and if you dont want to run it this way you dont have to, anyhow...

My wheels are 10.5" all around (factory size of staggered rears either style 87s or 168s).

Tires are factory sized 275/315 combo with front having a slight strech.

I got a hell of a price on these wheels new which is why i did not go custom or anything else, they are +35mm offset all around.

Rear setup is one H&R DRA 30mm spacer, stacked ontop of that is another H&R DRA spacer but 25mm size. Total of 55mm a side in spacers. This makes the track of the tires 4.3 inches wider then factory.

Front setup is 10.5 wheel, and 25mm H&R DRA spacer. So front track is about 2" wider.

That is what you need to become basically flush with factory rear 4.8is flares and front lemans flares.

If you are running factory 4.8is ride height you will get away with 30mm spacers making you flush in rear or a lesser offset+ wheel. If your lowered like me the wheel naturally cambers in more at the top, as well as with wheel travel, even though its mostly flush in rear i am not smacking into the flares over bumps, it only catches on the inside plastic lip which already wore away what it needed.

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2006 X5 4.8is Fully Loaded