What are the caps over the lug nuts called? I just got a disco and took it for some tires and now about half of the caps will not go on. Do they need to be replaced, or is there something I can do to fix them?

 

The wheel lugs do not have removable caps. They have fallen off because someone has used the wrong size socket to remove them. The correct size socket is 27 mm. The only fix is to replace the lug nuts. They ain't cheep either. Next time, go to A dealer or indy with experience on Rovers.