Even if you haven't the other 3 this would make a good decoration. Much of the apparent corrosion is only transferred from the steel outer and will clean up. Not sure which Bentley it fits but I guess from the 50's ? If you can help please do . Outer disc is 45 cm in diameter . The flat inner disc is 24 cm in diameter and the octagonal "nut" is 10.5 cms across flats.