This template is designed to help you determine which parts of the template are used for the left/right side of the vehicle.
It is recommended that you use some sort of 3D Painting program to create your livery assets but this and the .YFT/.OBJ/.DAE files can allow you to create your liveries with just Photoshop/Gimp/etc.
Please make sure you check your livery assets using the provided YFT/YTD files in the "Preview YFT Folder" file located at the root of this the archive :)

Key for "leftrighttemplate.png":

blue = left 
red = right