Professional Grade™ Rear Driver or Passenger Side Wheel Bearing and Hub Assembly by Raybestos®. The latest generation of hub units has a suspension mounting flange machined onto the outer shell with integral raceways, and a brake/wheel mounting flange with integral raceways machined onto the inner cone, making it even simpler to install and providing a degree of precision previously unattainable. Again, these units are pre-lubricated with an integral lifetime seal. They require no adjustment, are maintenance free, self contained and preloaded.