Clearly print or type all information, except signatures. Find out what documents you will need to provide proof of sale and ownership if you are buying, selling, or gifting a vehicle.You'll need to sign the car purchase agreement (or dealer bill of sale), the title, an odometer statement, and sometimes a damage disclosure statement. Yes, a purchase agreement is a valid and binding contract in NY IF the dodge dealership signed it. If they signed it, then they are held to its terms. I left with a signed purchase agreement from the dealership. 2 Part Form For Use By New York Dealers In Selling A Motor Vehicle. At PandaDoc, you can access a free car purchase agreement form template to prove your ownership of the vehicle. 1 If you're financing your purchase ; 3 The actual vehicle purchase agreement ; 4 Buyer's trade in certification ; 5 Warranty disclaimer and documentary fee notice.