Yes they are. But you should also have the other seal on the outside. Those are fairly rare, and as discussed earlier, Dirk Leegwater out of the Netherlands has them, or else it would now appear that Brian Asbury out of Canada has them.
If the seals you get for the inner or outer are leather (and many of them are) then don't forget to soak them in gear oil for an hour before installation. You are supposed to soak a leather seal in the fluid it is meant to control before installation.
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