I sold this 65 GS post sedan to a guy out of Wisconsin back in about 2005-2006. the car had a rebuilt engine and was a rare A/C prep car. i included a truckload of extra parts. just wondering what ever happened with the car.
Try contacting the Wisconsin DMV or a tax office there with the VIN. I'm looking for a car I missed out on a few years ago, went to my local tax office with the VIN and for $2 they gave me the name and address of the last titled owner. They can do this based on some Freedom of Information Act, or something. Completely legal, took 3 minutes, not counting the time spent in line.