need help

Jubba, welcome to the site. Those floorpans are available from autobodyspecialties.com. Be advised that I am 99% sure that doors from 1964 thru 1966 Valiants and Darts are all the same and are interchangeable if body styles are the same. Year One and Legendary are two of the better interior suppliers. Laysons also supplies parts for your car but they have a terrible reputation for not delivering. Used parts are abundantly available on Ebay and a lot of salvage yards in the midwest. What color is your car? There was a guy that was selling blue door and backseat panels on this site, and he still had them as of last week. Very inexpensive too. Post some pics of your car here when you get a chance, and good luck with your new ride. Mike