I've found some AMG mono block 18x8 ET 31 and 18x9 ET 35 in good shape and reasonably priced.

I am planning to put 245/40/18 front and 275/35/18 rear.

I've search the forums and I haven't been able to find the definitive word about whether these will fit my C43.

From what SpeedyBenz posted, it looks like the rear fenders will need to be "spread", not sure about the front.

Oh, my car isn't lowered, not really interested in lowering it as the front lip already scrapes in a couple of corners in my drive home 

Thanks.