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If you remove the carrier plate, you must drop the oil pan and re-seal the oil pan lip seal below the carrier plate, or you will have an oil leak there in short order.
The mating surfaces such as the crank and oil pan surrounding it?
the rear main presses in from the "inside" of the carrier, so I see no way to change it w/o removing the carrier. Once that is off, you can tap the seal out w/ hammer and punch.