They don't sell the assembly all bolted together if that's what your asking. You would have to buy the 203 and the 205 and the adapter then bolt it all together once you receive it. Since you already have both the 203 and the 205 it doesn't take much to mate everythig together. I helped Zakk do his and i think it only took an hour or so to mate everything up, then install into rig.
Actually, it is easier to install the 203 range box after you have installed the internediate shaft that ORD supplies with the kit, then bolt the 205 up to it while the rest is in the vehicle.