Help To convert my first mod

[Leto2405]

Hello,

I'm on the road to convert my first mod of gta SA to GTAV

I do all of detach and separated thing but now i have a texture problem
I follow au tuto in french (yes i'am french) but when i want to texture the wheel there is that (please look my vidéo ton understand)

If you can help me i will love you lol..