How to fill out the Private Car Sale Contract Template? Step 1: Write the seller's full name on the bill of sale.Use the legal name that the DMV will have on record. This is a tutorial on the California residential purchase agreement. Free fillable forms: City of Oakland. Non-Federal Agency (CA) Sign up. ("Seller") agrees to sell to. Use this car purchase agreement template to customize the financing information for your car along with other required details. Plan ahead and lock in great rates when you book your rental car at Oakland with Enterprise.