Nothing is ever as simple as it seems.  I had the rear axle fully assembled, and I thought I'd just double check the fit of the brake drums before painting them.  They don't fit.  More specifically, they are designed to go inboard of (behind) the hubs, not over top of the hubs, the way any newer brakes would be made.  (Even the Willys manuals I have show the drums going over top of the hubs, but I guess whoever made these drums wanted to go back to the original way...)  So now I have to figure out if I'm going to exchange these drums, or press them onto the back sides of the hubs.  (I sent a note off to the supplier for their opinion.)