U-Joints are cold forged from SCM-415 steel, precision ground journals are case hardened to HRC58-61U-Joints are pre-greased with hi-temp lithium complex 3 greaseBearing cups feature a Quad lip seal to keep contamination out & grease inCentrally located grease zero and grease channels in the bearing cup evenly distributes greaseKits include cap plug to eliminate grease zero for low clearance applications FITS THE FOLLOWING APPLICATIONS, ALSO SHOWS WHICH SHAFT/AXLE IT FITS:REFERENCES: (FRONT AXLE-1, FRONT SHAFT DIFF SIDE-2, FRONT SHAFT ENGINE SIDE-3, REAR SHAFT ENGINE SIDE-4, REAR SHAFT DIFFERENTIAL SIDE-5, REAR AXLE INNER-6, REAR AXLE OUTER-7.)KubotaRTV900 03-08 (ref. 6 & 7)