My vented rotor kit had the same diameter as stock plate rotors I believe but the diameter of the adapter plate created an interference at the e brake mounting area.
Club Cobra - mvanhorn8893's Album: Contemporary Front Caliper Interference - Picture
This plate diameter also caused an interference with the lower control arm. In retrospect this may never have been a possible condition with the shocks and coil over springs installed as the car is not likely to ever bottom out enough to allow that to happen.
Club Cobra - mvanhorn8893's Album: Contemporary Front Caliper Interference - Picture
Club Cobra - mvanhorn8893's Album: Contemporary Front Caliper Interference - Picture