Marco and I think we've found the problem with the rims.
There is an extra space in every rim java file:
public class Commodore_VE_rim_GTS_paintable extends Wheel
{
float f_offset, default_offset, old_offset, diameter, width;
public Commodore_VE_rim_GTS_paintable_( int id )
Instead, it needs to be:
public class Commodore_VE_rim_GTS_paintable extends Wheel
{
float f_offset, default_offset, old_offset, diameter, width;
public Commodore_VE_rim_GTS_paintable( int id )
The mod file will be updated shortly. In the meantime, this should be easy enough to fix manually.