It tooks little-bit longer, but... here you can download a 2010 Trans-Am Season Carset for great Trans-Am mod made by Project Wildfire, for great sim Nascar Racing 2003 Season....
Rendered cars are here: CARS PREVIEW
Some in-game screenshots are here: SCREENSHOTS
List of drivers is here: LIST OF DRIVERS
And this carset is avalaible for download at: 4Shared FILE SHARING (cca 34 MB)
The installation is easy > copy unpacked archive into <path to your game>/series/pta
Any questions? Feel free to ask me on my e-mail