The document is very important for both the buyer and the seller of the vehicle. It ensures that the history and all other information about the car is accurate and authentic. It also provides detailed documentation on the transaction that can be kept for both parties` records. Vehicle purchase contract with a private seller [DOCX, 18 KB] This agreement, which is referred to in several terms, such as.B. car purchase contract, usually contains information about the buyer, the dealer and the car itself. It also contains prices and how the vehicle is paid. 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). .