thanks for all the replies. I'll see if I can get hold of Murray and see if I can convince him to part with one of the wheels. I have got all four of the genuine centre caps in fairly good condition so if I got yours they would just take up extra space. Its only not on in the photo because the paint was still wet on the wheel. Cheers for the offer though.
Do the 18" wheels have tyres on them? and how much would you be looking for if you were to sell them? The main problem is I'm a bit short on money as I'm a student at the moment which is really the only reason I didnt just buy a replacement set of wheels from the US