Heres the deal,
There is a Fleetwood and a Fleetwood Brougham... The Brougham was a package that included different wheels, way better seats, some heavy duty stuff, and the vinyl top.
The Fleetwood came with a steel roof but a vinyl roof could be added as an option.
The Fleetwood Brougham came with a vinyl roof but it could be deleted as an option.
The wheels could not be interchanged and are the easiest way to tell the difference from a distance.