Component Part(s) Bill of Sale. Instructions. This form must be submitted with the Rebuilt Vehicle Statement (Form VTR-61) when submitting a new application.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. How to fill out the Texas Vehicle Bill of Sale Form? County of Harris. §. The form must be submitted within 30 days of the sale. This guide contains pages with important use tax information for your purchases of Vehicles, Vessels, and Aircraft.