wtf **^%$

I think you are still mis-understanding terms. What you call a "hat" is the "drum". The "hub" is the smaller center piece that holds the bearings and has the wheel studs pressed in. The hub is usually re-usable. I doubt you could find a new one. The bearings are very common. I recall they are Timken "SET1" & "SET3" for the 9" spindles, which is National AP1 & AP3, but check rockauto. Order carefully, because often the bearing "cone" doesn't come with the "race" (hence the "SET" PN). In 1973+ front disks, the "rotor" and "hub" are a single piece, but that is uncommon in most cars.

If your front drum has never been removed since the car left the factory, it doesn't come off as easy since the factory swaged the studs to hold the drum on. "Swage" means they crimped little dimples in the studs. Most cars would have had the drums changed by now. If not, you can remove the swages many ways. In the junkyard, I once beat the studs out with a hammer. The old drum tore the swages off, so the studs came out the hub without damaging it. You could probably cut them off with a Dremel drill w/ metal-cutting wheel. There was a shop tool to cut them, that I understand fit over the wheel stud (never saw one). Another way might be to cut the studs flush (hacksaw), then drill into them past the swage. You then need to get the hub off the drum, since it is held/rusted at the center hole. The classic method is to the throw the drum down in an asphalt parking lot (usually a closed business), like an upside-down cup, until the hub drops out.

You can get replacement studs at most auto parts stores. Most have a "stud kit" under the counter. Might be smart to use all right-hand thread today.