300tdi is same as later ,originally wheel bearings ran with oil and hub seal was oil seal then they fitted 2 hub seals on to keep oil out of bearings (outer one )inner became grease seal ,then they fitted oil seal in stub axle when 300 tdi came out , middle 2 seal idea was better as this allowed oil to lube drive member and half shaft splines ,later doesnt and wear there is often an issue