wheel spacers are a no-no
The MBZ wheel/hub system is designed for the hub to fit snugly into the center hole of the wheel for perfect centering. The lug bolts are not designed to center the wheel, but to hold the wheel onto the hub assembly and resist the cornering forces. There is normally no radial (up/down) force on the lug bolts as the wheel fits snugly on the hub and is clamped to the hub by the bolt tension, which fit absorbs all the car weight loads. Improper 'spacers' will not allow that clamping to the hub action and the car weight will constantly try to shear off the lug bolts.