I HAVE 4X4 COSWORTH CALIPERS AND 2WD DISCS ON MY S2 EASY TO FIT ONLY NEED A 1MM WASHER BETWEEN THE HUB AND THE CALIPER STOPS EXCELLENT I ALSO HAVE XR4I REAR DISC SET UP,OTHER OPTION IS 2WD DISCS AND S2 CALIPERS WITH A BRACKET SO THE CALIPER SITS HIGHER