Yeah, i didn't think you would have across this! I really appreciate your help. These are what I have; I have seen this and guess that the special nuts are basically collared to fit into and fill the holes. Like these;

Hi I have bought a set of L322 wheels and appropriate adapters for a mk4 golf. A few people have said that I need specific nuts for these wheels. AND that they need to be the "black type" nuts. Other than the obvious fact that the faces of the nuts are flat and not conical or tapered, what else...