The foreground caster bearings on your Chevy Chevrolet Silverado Wheel Hub are army on the caster hub as an assembly. If the caster bearings are damaged, you charge to alter the accumulation as a individual unit. This agency you will not accept to use appropriate accoutrement for the job. The bearings appear pre-packed with grease and closed from the factory More details .......... http://www.buyautoparts.com/autoparts/Chevrolet/Silverado/Wheel_Hub_Assembly.html