Information you can expect to fill out includes the car's VIN, make, and model, the name and permanent address of each party involved, and the sales amount. Find out what documents you will need to provide proof of sale and ownership if you are buying, selling, or gifting a vehicle.How to fill out the Private Car Sale Contract Template? Use this car purchase agreement template to customize the financing information for your car along with other required details. Instructions. The new owner's social security number, taxpayer identification number (TIN), or federal employer identification number (EIN) is required. The Hyundai Mobility Form and required documentation must be submitted to Hyundai Motor America within 60 days of complete installation of adaptive equipment.