Technical Help Identifying Wide Five Drum

Hey guys,
I saw this roadster at TROG last October and the vented wide five drums really caught my eye. Especially the front, which looks like a one piece casting. The rear looks like a two piece and I managed to snatch up a set as a backup.

Does anyone know if these one piece drums have a specific name or are they aftermarket or whatever? Any help is appreciated.

 

Ford option I believe, called Rocky Mountain brakes.