Originally Posted by Raindrop
Alright so was at local MB dealer and asked them for the part number for grease cap for rear wheels. They told me that rear wheel bearing unit is a 'sealed' unit and it does not need grease a cap. Although from wheel bearing unit would need a grease cap.
Has anyone else heard of rear wheels on W211 or W219 vehicles not needing a grease cap?
Most rear-wheel drive vehicles do not have grease caps on the rear wheels. It's just a completely different design, different types of bearings, etc.
The wheels you bought are the wrong offset, which is why the grease caps are sticking too far out. You will indeed need spacers on the front, and you will also need extended lug bolts. Work with a good wheel shop to make sure they don't screw it up. The bolts need to be the right length and the mating surfaces have to match. Conical seat, ball seat, radius of ball seat, etc.