Tom,
IIRC Mike arranged a special run that was just the rotors, and the castings did not contain the bearing hub
The common problem with the mustang rotors is for efficiency reasons almost everything currently being made incorporates the hub and rotor into a single casting. They come with SAE studs that cannot just be removed and easily replaced with matching OEM metric studs.
I know the image in the Amazon link shows just a standalone rotor but I would not take that as indicative of what would actually be shipped
The Amazon listing doesn’t indicate free returns but I believe that is a standard even with third-party shippers. This item does not ship from Amazon so I would advise contacting the actual seller to learn if free returns are offered should the items delivered not be what was hoped for
Larry