Purists insist the factory-correct upsize wheel for the C140 coupe is the 18-inch Eltanin, sold everywhere except North America, and that AMG Monoblocks were sedan wheels never fitted to coupes from the factory. Nonetheless a large share of owners run Monoblocks for the look, and the small US-market 16-inch wheels are widely seen as unflattering to the proportions.
Wheels: the correct Eltanin coupe wheel versus Monoblocks
Mercedes-Benz S-Class Coupe / CL (C140) · cosmetic