They are the factory styled road wheels, they were made in 14 inch only and 6" and 6.5" widths, front are standard 14x6 and rear is the center in a 15x8 band with 4.75bs runing 275x60x15.
The wheels are a close copy of your olds rallies. here's a charger I once owned, widened factory style road wheels, note the similarity to the Oldsmobile wheel.