Disabling skin changing on tdm cars?

Just wondering if anyone could possibly tell if it is possible to disable the skin changing on certain cars or just get rid of each skin so there is only the single skin for the car?

http://puu.sh/9XxeP/c267f3a7cc.png

You’d have to decompile the model and remove the skin groups to rid of them completely. Otherwise, to block changing, most admin mods support permissions for that kind of stuff.