That is August 2002 as on the door sill plate, I don't know if it means whether 8/02 is included or not.

Toyota does not list the bearing case you will find on the tundra for use on our trucks. The data implies you will have to get one from the dealer or a Taco.

MAYBE, you will find the Tundra bearing case bolts up to the axle and the T100 brake plate fits on it. They both hold the same bearing.

You need the bearing. Even if the bearing case fits, you will have to install the T brake, and you will want to get the seals... Taking it apart destroys the bearing and collar.

The bearing for the old axle that you have now is some standard part like a 6308. The bearing for the new axle has an extended race that pokes out from one side. This is how to make sure you have the right one for the new axle.