Good day to You! Front axle brake system Brembo 390-36 19″ wheel discs allow to fit in a huge brake system. Choice in favor of a maximum size brake rotor was made for a standard AMG caliper (cast iron). Brembo 390-36 rotor
With these adapters you could be able to upgrade front brakes on your Mercedes G500 You can install front rotors and 6-pot AMG caliper on front axle of G500.