Toying with some W140 front brakes. It appears the rotors are around 320x30mm which are slightly bigger than S2 W126. Crossing fingers they might fit without major mods on standard S2 W126 hubs/rotors.
No I’m definitely not the type of nutter that would drill holes in a brake surface. Yes new rotors but even the ones manufactured with holes aren’t that great. I prefer the ATE slotted design, but they’re not easy to find anymore.