Mercedes S-Class Extreme tyres

Hello together. I have a w126 420sel (HA level) would like to mount the following marking: Tyre size front: 10J x 18 245/40ZR18 Tyre size rear: 11J x 18 285/35ZR18 Each have the ET35.I know that my car is not allowed over et30, otherwise it would grind from the inside, that is et20 or so is ok.My question is, can I also have et-? Or does it always have to be in the “plus range”?? Have thought if it should fit… At the front I would like 20mm discs per page or better take 30mm per page and at the back too… Or is it wider?? Have I seen 60mm slices per page This looked really brutal… What do you say, how should I – which distance disks to install??? Thanks already in advance.Ps. Please no doofen remarks, who has anything against it, can also go to the w124 forum.