I've spent many hours looking for the same....it's simply not possible to make the 8 stud pattern fall within the bolt circle for 5 on 5.5. This type adapter machined from bar stock is a common item for many bolt pattern conversions, but not that one!
You will find such an adapter for a dual rear wheel conversion, those units are normally forgings or billet-machined and fairly expensive. They also add about 8" to the tread width of the axle on which they are installed and are not rated for use on the front axle of any vehicle.