Like 36 B A said, you have to pull them into the housing from the inside using threaded rod and a pulling disc of correct size. If you simply drive the seals in as you would a smaller diameter seal, it is highly likely it will be distorted and leak once again...something you won't want to happen.
Once the seal puller is snug (use a little wrench as if you pull it too hard it will distort the seal) use a little hammer to tap around the seal puller disc and little by little and bit by bit tighten the nut on the rod until you have the seal seated. Take care not to damage the seal lip when installing the axle...it's highly recommended to have a friend helping for this repair job.
Best of Luck,
Tyler in IL