I know that as of late, we've had a few 1969-1973 Chrysler police cars added to the site. I myself watched "The Sugarland Express" yesterday and had a hard time telling the difference between the Dodges/Plymouths and their years. So I'm providing this link for you guys that I hope will help to better identify the cars whenever they come up:
http://www.fuselage.de/ident.html