Nigerian Sales Agreement. 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. View, edit, and fill out Vehicle Sale Agreement Form in no time with FormsPal! A reliable online service to download legal docs and PDFs in minutes. How to fill out the Private Car Sale Contract Template? This document is a vehicle purchase agreement between a buyer and seller. A Sales and Purchase Agreement (SPA) is a legal contract that details the agreement's terms and conditions. A Michigan motor vehicle bill of sale records all of the details surrounding a vehicle's sale and purchase between a private buyer and seller. When buying a vehicle or equipment for your business, use this Vehicle and Equipment Purchase Agreement to protect yourself from unwarranted liabilities.