Generic 3-D vehicle models needed

I need 2 or 3 generic vehicle models in Collada. The vehicles should be typical sedan or coupe size cars with no branding or other IP. The cars should have a photo-realistic texture and be of relatively low poly count. The vehicles will be distributed to students for use in a vehicle simulation environment (primary focus is on physics development for simulation vehicles, but our environment requires raw .dae files for visualization).