They look the same but the offsets are different. Your wheels are shared between W215 & W220. Part numbers for the CLS55 PP wheels are A2304000102 & A2304000202.
Jules is correct in the upgrades he mentioned as well as the Stage 1 & II Eurocharged remap, Eurocharged TCU SLR remap and 82mm throttle body as well as the cosmetic changes i.e. colour coded engine, carbon fiber rear diffuser and C/F front lip spoiler. All in all, approx £10k was spent modifying this Beast and only £2k was cosmetic. A bargain as some of us don't have the time to modify our cars so a no brainer really. Oh, and yes....... I am very happy with the car, Jerry@Eurocharged is sorting out the Stage 3 for me now..... and I paid £18500 so mustn't grumble