Sample Motor Vehicle Bill of Sale. The form consists of the significant vehicle, buyer, seller, and sale data, along with affirming signatures from both parties.Where can I renew my vehicle registration? Though standard form bill of sales are available online and from your local county tax collector's office, it's also perfectly acceptable to write your own. This transaction is made in the County of. ,. Sign the buyer's application for title: When selling a car in Texas, you'll need to sign the Buyer's Application for Title, which is Form 130U.