Hello, welcome! 
You mean the car files that you could download and see how they are built? I’m sure there was a thread with those, possibly more than one, but a) I don’t remember how to find those threads and b) by now those cars are probably quite outdated. I can tell you that my random stuff thread contains some downloadable cars that are, I think, all up-to-date enough for the current stable (default) version of the game. Those are not the best optimised, and I’m not as good at designing whole cars as I am at engines and drivetrains, but I guess they could be helpful anyway.
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