Hi, I found some but not sure which one you would like, so try the three links of them.

Link 1: http://sketchup.google.com/3dwarehouse/ ... revstart=0

Link 2: http://sketchup.google.com/3dwarehouse/ ... revstart=0

Link 3: http://sketchup.google.com/3dwarehouse/ ... revstart=0

Happy Building
Jack