The drum has the inner and outer wheel bearing in it. The wheel studs are pressed into it too. This drum uses 8 1/2"x20 wheel studs.
It turns out that I did have the 12 x 2 1/2" shoes. Also, when I removed the drum, the shoes were fine and the only thing that seemed out of order was the cable that runs to the star adjuster was off the guide at the rear shoe. I sprayed the heck out of everything with Brakleen, reattached that cable and put it back together. Oddly, it stops just fine now.
I just find it strange that the NAPA and RockAuto files show drums that I have not seen used before.