109" Salisbury Rear Axle Wheel Bearings

On the rear axle you have part RTC3511 which is a rubber seal and bearing RTC3429. It seems logical to me that the outer sheath of the bearing slots inside the rubber oil seal, however, with the parts in front of me it seems the bearing outer sheath is a fraction too big for the oil seal (the outer part is metal so not flexible)

Is this because i'm using copy parts which aren't 100% accurate (no britpart!) or am I doing something else wrong?

bearing doesnt sit through seal you fit inner bearing races then the grease packed inner bearing the seal the turn it over and fit outer grease packed bearing