The car "A Bug's Life" is the only vechile in the movie
The car in "Finding Nemo" is the only indentifiable vehcile in the movie
The car in "Monster Inc." is one of many, but I'm almost positive they are 'Made for Movie", so not usable.
And yes, this is for three movies. What I ment was, the other pics were already on the site (Toy Story, etc.) or were to small (Ratatouille)

Does that help?