Under the hood, or under the car.
A used wheel hub / bearing is priced on 247 generations across 140 nameplates, listed below by make and model. Open one for the asking price on that car and what else the part fits.
A transfer case is heavy and comes down from under a truck that is sitting on stands. Bring a helper, and ask the yard how it wants one lowered.
Typical sizes, not a promise for every car. Everything to bring to a pull-your-own yard.