Find out what documents you will need to provide proof of sale and ownership if you are buying, selling, or gifting a vehicle. You'll need to sign the car purchase agreement (or dealer bill of sale), the title, an odometer statement, and sometimes a damage disclosure statement.Description of the Vehicle. ACCEPTANCE DATE: ("Acceptance Date"). SELLER'S INFORMATION: Seller's Signature: Seller's Name (print):. Use this car purchase agreement template to customize the financing information for your car along with other required details. I signed a purchase agreement for a new car and later noticed they increased the price of the car and added on things I did not ask for. Write out your own full name, and that of the buyer. A confusing and convoluted document that outlines the selling price, fees, taxes, your trade in, and more.