Back in the early 70's I never thought to keep anything with the vin number on it. The best shot of finding it is through the county where I lived if they still have records of taxes payed stored somewhere. Their computers only go back to 1996 now. I am going to contact them to see if they can help me. I am putting a picture of a model I made as the car looked like in 1973 when I sold it back to the Plymouth dealer.