The buyer and seller should meet at a notary, tag service, or motor vehicle dealer to ensure the title application is completed correctly. A Pennsylvania vehicle bill of sale is a legal document formalizing the sale and purchase of a motor vehicle between a buyer and seller.1. Enter the Buyer and Seller's details. This form is used to obtain a Pennsylvania Certificate of Title for vehicles not currently titled in Pennsylvania, or which were repossessed (1. Vehicle Payment Plan Agreement. A vehicle payment plan agreement is a contract between a buyer and seller of a vehicle that agrees to installment payments. A Pennsylvania motor vehicle bill of sale is evidence of a vehicle's transfer. Use our template to build your vehicle bill of sale.