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. A confusing and convoluted document that outlines the selling price, fees, taxes, your trade in, and more.We've put together this guide to simplify car purchase agreements and help you stay protected when purchasing vehicles or selling them. How do I fill this out? Filling out the Motor Vehicle Purchase Agreement is straightforward. 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. By signing this contract, I choose to purchase the motor vehicle on credit according to the terms of this contract. A vehicle purchase agreement or vehicle contract is very important. Here are the templates that you can download and print.