I am no longer able to source my plugs (ZD29) from rock auto anymore due to the ban in Arizona. I do have some NOS Beru plugs that are in factory bulk pouches of 100. Per my research, these are true NOS plugs. These don't have motorcraft on them, but Beru. These will come in loose packages. These have been given out to several people with no complaints. I would put these in my truck if my current ZD9s gave out. These are not cheaper because they are clones from China, or any such thing. They are real to the best of my knowledge, and will work. Please reach out if you have any questions. If any issues come up from these, please reach out as I will rectify any failures when used with properly working controllers for 6 months after purchase. This excludes manual button, ether, or glow plug controller based failures from non IDI Diesel purchased controllers. 
-Roderek