MOHO chassis uses same brakes as any DRW (Dual Rear Wheel) E350/450. You might be able to get just the Rotor and not the Rotor/Hub assembly. If you do that, it'd be a good idea to have somebody put it on a brake lathe and make sure it doesn't need to be cut a little to run true. It will likely run true if you clean the mounting surfaces thoroughly and torque the screws carefully.
Just make sure the Wheel Studs are long enough to let you mount your wheel simulator retaining nuts, if that's the setup you have. If your best deal on that part includes short studs, you'd only have to have a shop replace two of them with longer ones to accommodate the retaining nuts.
Just looked at Autozone and they have only the complete Hub/Rotor assembly. They show one for 2-wheel ABS and one for 4-wheel ABS. We know your chassis has sensors on the front, so I'd take that as 4-wheel. Might be wrong but I believe any 2-wheel ABS was Rear Wheel ABS, called Rear ABS or RABS. When you get the rotor assembly off, you'll see a toothed "wheel" surface inside the hub. That interfaces with the tips of the sensors you're seeing the wires for. And that's the hub you want. Wish they'd say "4-wheel" or "Rear Wheel" or "Front Wheel" instead of "2-wheel."
You'll be packing bearings, so be sure to get High Temperature Wheel Bearing Grease. The old-fashioned stuff that worked with drum brakes will melt and run out of the bearings in a disk brake vehicle. They actually sell a "Ford Approved" flavor. Not sure that's essential, but Hi-Temp indeed is.
My guess is you'll need pads and probably calipers. Ideally hoses too, but don't forget the lube for the caliper slides, again Hi-Temp.
You'll need a 21mm or 7/8" wrench, ideally a socket with breaker bar, to get those caliper mounts off to remove your rotors.
Might want to check with Quad Van and see what they have that they'd sell you less than the full Axle-and-Brake "kits" that Bryan and I bought. Just the Brake parts. Just remember you need the pre-2008 parts if you don't want to replace and upgrade both sides, and there might not be any of those laying around. Gotta tell you, if you're gonna pull the whole rotors off, need at least one rotor, and your calipers/pads are suspect, I'd get a "Brake Kit" (without axles and radius arms, upgrade to 2008+, and improve brake performance while you do the repairs.
If you don't know how to adjust the wheel bearings, look it up or ask us. BTW, with a "Kit" I didn't even have to buy seals or pack the bearings. Those chassis are delivered on carriers, so essentially zero miles on the parts.
