That would be me.
It starts off with a Ford Motorsport HD fabricated kit housing, 4130 tubes and 4340 (or 300M) axleshafts. It maintains the 4.75" bolt circle... as it utilizes the Corvette C5/6 wheel bearing cartridge.
The housing and axles can be made to fit any width, at the time of manufacture, and the leaf perches can be welded or left loose for the end user.
Moser
... now that is a scarry thought.