I give up now. I'm searching someone who wants to continue my modification:
2016 Lada Vesta ( https://de.gta5-mods.com/vehicles/2016-lada-vesta )
I don't know what I'm doing wrong, because the textures in GTA don't really work. The interior color stays white in GTA while in ZModeler 3 it is dark. More or less the same is with the tyres, while driving the textures are changing. I tried to google, but it doesn't really help me.
If someone is interested to continue this modification please contact me.