The  way I convert sketchup models is with the demo version of Sketchup Pro. This gives you 8 "anytime" hours you can use for converting. I've converted several hundred this way and still have about 3 hours left on my demo time.
 
Anyway, here is a link to the 'cudas they have there:

http://sketchup.google.com/3dwarehouse/search?q=Plymouth+Barracuda&styp=m&btnG=Search&reps=2

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