Why is it that neophytes with less than 50 posts act like snowflakes, challenging the advice from "auto forum dudes" who have been there, done that, and then whine and have a hissy fit when their ignorance is challenged.
@middlecalf is right, go for it and report back.
Look,
@pjohnson gave you a picture of the drum assembly in post 11.
That machined surface on the splined shaft sticking up from the drum sets inside the transfer case. The seal you intend to buy rides on that surface. The seal keeps the oil in the transfer case and out of the brake shoes...