Wheel Bearing Hub Inner Dust Cap - E36, E46, E34, E32, E31, Z3, Z4

The dust protection collar acts as the dust cap and protects the back of the wheel bearing from dust and debris. It measures 69mm in diameter and is pressed on the spindle before the wheel bearing and hub. Because of its location it is susceptible to moisture and harsh chemicals and they often rust or become brittle. For this reason we recommend replacing your rear dust collars when you replace a wheel bearing. 

This is the Genuine BMW dust protection cap / collar. You can be assured of the best fit and quality. This is Genuine BMW part # 31206777788 (31 20 6 777 788), sold individually. Be sure to order two if you are replacing both front wheel bearing rear dust covers.