This is an All Balls Rear Differential Bearing and Seal Kit. It includes all bearings and seals in the differential housing. We also offer the "rear wheel" bearing and seal kit, which comes with the bearing and seal in the brake drum backing plate as well as the seal in the brake drum cover. Contact us for details if you need this kit or any other parts for your Honda 300. We carry axles, ring and pinions, hubs, complete differentials, differential housings, brake drums, shoes, and many other items. Let us know what you need!