This document terms as the source for defining all the terms and conditions that are required while setting up a sale and purchase of a car. ACCEPTANCE DATE: ("Acceptance Date").SELLER'S INFORMATION: Seller's Signature: Seller's Name (print):. This car purchase agreement template is a standard agreement made completely customizable for your individual needs. Shop our selection of vehicle purchase agreement forms and We Owe forms. Choose what works best for your auto dealership. An Illinois motor vehicle bill of sale documents the purchase and sale of a motor vehicle between a private seller and buyer in the State of Illinois. A master purchase agreement is a legally binding contract between buyer and seller, and typically relates to buying and selling goods rather than services. A vehicle sales agreement is a lawful arrangement summarizing the terms and conditions of a vehicle sale between a customer and a seller. Please return the original via US Postal Service.