The vehicle sales agreement is between a seller and buyer for the sale of a vehicle. It specifies the vehicle make, model, year, and other details.Nigerian Sales Agreement. It details the transfer of ownership and possession of a vehicle. A vehicle purchase agreement or vehicle contract is very important. Here are the templates that you can download and print. Add a Car Sale Agreement Template that requires editing, or create it from scratch. Edit, secure, annotate, and make your form interactive with fillable fields. How to Write a Real Estate Purchase Agreement.