Sale Details: Specify the purchase price, payment terms, date of sale, and any additional conditions agreed upon. 4. Visit the California DMV's website and download a bill of sale.This is the motor number or serial number required for identification purposes. A California motor vehicle bill of sale is part of the vehicle registration process. Use a free template to write your own bill of sale. Payment : The bill of sale document should also state the method of payment used such as installments or in full, cash, check, credit card or bank deposit. A fully customizable California bill of sale template. Whether you're buying or selling a vehicle, boat, or personal property, our template makes it easy. We've assembled a convenient checklist to help you get all your papers in order and sell your car legally and with a minimum of fuss.