The whole wheel was stripped, powder coated, centre and rims diamond cut then completely lacquered. From memory it cost about £380 with fitting and balancing of new tyres which I'd supplied.
Here's where I had them done.
http://www.jpalloys.co.uk/
I bought my decals off a member, who had bought the genuine ones from the states I believe.
With the centre caps I'd say mine were about the same if not worse than yours. I sanded them down with various grades of sand paper to remove the lacquer and the pitting in the alloy. Then with a polishing wheel in a battery drill and metal polish and a lot of elbow grease polished them up. Took me almost a whole day mind to get them to a standard I was happy with.
I looked into getting new, but the type for these LMGT4's with the metal clips (not the rubber ring ) are no longer available new so this was the only option.