gsxr, how is it that the 400E calipers and rotors bolt onto the W201's stock suspension, particularly the 2.3-16 and 2.6L, that uses the same parts as the W124 300E? Is the lower A arm on the W124 designed/manufactured differently? Replacing the dust shields with the larger 400E units goes without saying, as does the need for the rims to clear, although the 400E did come with 15" rims.