Looking great, another of my favorite movies
Here are some links for both cars
the Ford Aerostar:
Search results for ford aerostar in Cars & Trucks
Used Ford Aerostar Cars For Sale In Guyton, GA - Yahoo! Autos
and the F 150:
Search results for F-150 1987-1991 ford f in Cars & Trucks
There are also blueprints for both cars, just ask if you need them, should help you to get them perfectly acurate
Keep it up.