Its the piece which carries the bolt. The Bolt just pulled through breaking all plastic around it. Like I said its about a foot or little more in diameter. I noticed from some of the shots on Ebay that a lot of the rx4's are missing the wheel cover too!! Drewpy I didn't see the part i'm looking for but thanks for the info a lot of rx4 stuff there!!
The lower spec RX4's didn't have the wheel cover as standard, so if they have steel wheels, they probably didn't have a cover to start with.
Could you take a picture, I rarely took mine off, so I'm struggling to remember how it went together, but I may have an idea......