Used Car Sales Contract Seller Details Full Name: Address: Postal Code: Phone Number: Buyer Details Full Name: Address: Postal Code: Phone Number: Vehicle Details Manufacturer: Model: Year: Color: License Plate: Current Number of Mileages (confirmed by). After you have definitively decided which car you have purchased, the last step that will follow will be the paperwork. This process usually involves signatures on the car purchase contract or the car purchase contract. This document contains all the necessary information relevant to the car store concluded between you and the dealer/seller. As with any contract, you must understand all the information contained in the sales contract. .