I think these will require you to completely remove the OE brackets. May require a little fabrication also. Not sure if you want to go this way or not, just another option!
http://www.absoluteradiator.com/Universal.asp
Steel Radiator Mounting Brackets
Steel mounting brackets for easy installation of universal fit radiators. Brackets bolt to car core support and radiator sits in saddle of brackets. No welding required. Two top and two bottom brackets included. We recommend the use of rubber monting pads, listed below, when using these brackets.