Help with 3D kits

I am making 3d kits for the southern premier league, but there are not showing up.
i can't see anything wrong with the config, is it something wrong with actual images or where I'm putting them?
can you even change the 3D kits for additional leagues? i want to get this working so that anybody else interested
can use them, and will move onto the other two leagues at that level when done for anyone interested.

thanks.