Change rotation of several simple models in fbx files to z axis forward for Unity3D

I need to change all the models,from -z axis forward to z axis forward(rotate 180 degrees around y axis),which is a Unity3D convention. All the models in the following unity asset need to be processed,in total there are 28 fbx files,each file contains a single simple vehicle. [login to view URL]!/content/26537 . I will send the package to the winner. Some models have seperated wheels,all the wheels should rotate to z axis forward too. Please first finish [login to view URL] and send me for verification. Make sure all the textures and materials will remain the same,and work right in Unity3D editor. It's a simple work can be done in half a hour,my budget is $30.