Help me on this one. I took this off my 68 about 15 years ago and sat back in garage. I started piecing together what that car was originally and was looking at the tank codes. It looked to me to be the factory radiator or had been on the car forever. BBC car everywhere else and this was a 4 core with auto trans cooler. IL and ON tank codes. I cant find ON code anywhere?. I still have the radiator and am tracking the car down. Thanks.