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I will use W203 discs. I think only US C230 had four pot they were two pot in Europe. Hard to find here
The issue is the offset or height of the rotor hat. W203 and w209 4 pot calipers will all fit. I used w211 E500 4pots on my w203 because they were smaller (312mm) thinking so they would fit inside 16" wheels. Turns out it was a waste of time because 330mm brakes fit just fine. I had to make some modifications to the e500 calipers to make them fit. Again the offset is important. If I had to do it again I would use CLK 4pots.
Was busy with work. Found 330mm discs and guy had 4pots that came off W203 so I bought them. I'm gonna sell W220 calipers.
I took some measurements and can confirm that 6mm spacer will be needed to install W220 calipers(as long as they say "330" on the side) on W203. W220 are easier to find as cars are cheap. Calipers do look the same except the mounting ears. Didn't compare piston sizes.
This mod will work with W203 330mm disk. Don't have W220 disk on hand but offset is not the same as W203 one.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
