DiRT Rally How to change wheel / rim textures in DiRT Rally?

[Cyberpunk]

I would like to change the wheel textures same to the skin change of the car.

After overwriting the original wheel textures with another car ones, somehow a rest of the original wheel texture remains in black. I tried to figure out the problem in kind of an missing alpha channel or something like that, but didnt succeed in any way.

Maybe someone of you can be of help?

you find attached a screenshot of my problem...

greetz
zombie