Exactly - my stock brakes have about 3mm space on EACH side of the dust shield. The E420 rotors are 6mm deeper, taking away all that space. Basically even if I jammed the dust shield against the LCA, it would still possibly rub the rotor - just zero space available. If not there would be zero space on the back side and no more than 1mm to the rotor. Just too close, IMO. This is for the 294x25 E420 rotors. I don't know how the 300mm or 320mm front rotors would work. Note that all the 124's with 300/320 rotors use the 129 knuckle & hub.
BTW, my spreadsheet has been updated with corrected part numbers, current pricing, etc... make sure the copy you're using is dated Feb-24, 2004, or later.
