Im getting ready to replace the front rotors on my 1983 300D. Do I have to replace the bearings? It doesnt look like it from the pics from other posts. Im not looking for an opinion but a reply regarding how long the existing bearings last. Im not getting any noises normally associated with failed bearings and the car rolls... Any problem using bearings from a local chain? I usually try to stick with Autohaus AZ due to their low pricing on OE parts.