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. Vehicle Sales Agreement (Nigeria). When buying a vehicle or equipment for your business, use this Vehicle and Equipment Purchase Agreement to protect yourself from unwarranted liabilities. How to fill out the Private Car Sale Contract Template? A purchase agreement letter between seller and buyer is created when two parties come together, where one party desires to purchase a piece of property. The buyer takes the full ownership of the Vehicle (Make, Registration Number). bearing.