Some left-overs have been left on both platforms, PC and PS2, like the Cougar and the Toyz.
Here there are some models that have been made to look like the ones in early screenshots/trailers:
Jinx. - Texturing
Aztecas_5 - Modelling
Jeansowaty - MVL Version maker
DO NOT USE THIS MOD IN MODPACKS WITHOUT MY PERMISSION!
DO NOT EDIT THEM WITHOUT MY PERMISSION!
DO NOT HOST THIS MOD ON ANOTHER HOST SITES!
If you want to replace a car, simply replace them using:
GTA Garage Mod Manager