Since some people asked for it, here are all the GTA III PS2 Vehicles for PC. Just copy the folder into the modloader directory and done!
For the best PS2 experience, install aap's SkyGFX and the PS2 Map
Mod Loader version
EDIT: Sorry for the misleading title, i totally forgot to rename it, it's been a really long time since i started a new topic It should be called "GTA III PS2 Cars for PC"