I think I'll switch gears now. The cast hub is drilled through and tapped. The threads are shot. I was going to get long bolts and put a jamb nut on the back. Now, I think I'll just get some Dorman 610-419 studs and press in from the back. Then I can use conventional nuts on the outside. I can even get deep nuts and keep the threads protected from the mud/water.
That part number you gave me was for nuts. I was originally looking for studs, as in, long bolts.