No, in a word. 2wd calipers are 4 pots which won't fit under standard S1 rims. I run Escort Cosworth 4x4 calipers and 283mm 2wd discs. They go (just) but don't plan on having any stick on weights on the inside on the rim as then the rim won't clear the calipers as they rotate - it's that tight. But they WILL fit.