Car class colour is hard coded to each class name in my plugin.It don't change the car class colour.
Just change the overlay colour
Your best solution (if it already gives a colour for that class) is to do a conversion 'if' statement....
If (classcolour = xxxxxx,yyyyyy,classcolour)
So if it matches make it your custom colour (yyyyyyy)..if it does not match then use the default colout I give from the plugin