All early models of the Mini with drum brakes use this same drive flange! The front hub bearing in this version use the shaft that is part of this flange as the surface for the inner race. The later cars have the race directly on the very hard surface of the larger CV joint. In this version the splined smaller CV joint slides into the shaft. The problem with this is that if the wheel bearing end float is not tight enough then the bearing will spin on the shaft and destroy it! The shaft of the flange should be perfectly smooth with no steps or grooves. But the biggest problem is that this drive flange/shaft affair is in very limited supply!