The bearing with the seal all the way around it is #MTP 4986....The number on the bottom if the crankcase of the 46 using this bearing is 530-049794 and 3254...........This bearing won't fit in the other case, which is narrower because the seal is not part of the bearing, and the case is slightly narrower across the bottom..The wider cylinder is black, the narrower on with the smaller bearing is natural cast aluminm color....Why not take the case off and look at the bearing ?