1967 barracuda brake rotors help

Rotors are not hard to find at all, these days.
Lots of Amazon vendors, sellers, have them.
Rock Auto.
Any of your local parts stores, that stock, or can order, Centric parts.

You remove the old hub, and install it onto the new rotor.
Easy peasy.

Is there not a Mustang one piece rotor that just needs minor machining to fit as well?