Find out what documents you will need to provide proof of sale and ownership if you are buying, selling, or gifting a vehicle. Clearly print or type all information, except signatures.I recently put a property under contract using a California realtor. I used the CAR form RESIDENTIAL PURCHASE AGREEMENT AND JOINT ESCROW INSTRUCTIONS. If you're leasing a vehicle, most finance companies will include a buyout option as part of your lease agreement. A bill of sale application must include a Physical Inspection of a Vehicle or Watercraft - State Form 39530 . Using a Bill of Sale as a Supporting Document. 1. Enter the names of the Seller and Buyer along with the agreement date. Most third party administrators allow up to 60 days from the date of purchase of the vehicle to purchase a vehicle service contract.