Are the knuckles the same on the Coupé and sedan? So I changed my brakes the other week and noticed my 2012 e550 Coupé has “2 Piston” front calipers! I thought they were 4 piston fronts. Coupé is C chassis blah blah (which that thought process has never made sense unless the build was exactly the same quality, it’s not) doesn’t mean parts are not interchangeable. I was curious because if the knuckles are the same then the sedan 4 piston calipers would bolt straight on as the rotors are the same, am I wrong or missing something? I understand the rear of the car has w204 brakes etc, but the front are similar to W212 correct?