It is because the 3D Model was ripped from Pcars, like most of the models for AC are ripped (Forza,GT,AMS,GTA and many more)
The Model for the mod was from the first apereance of the M1 in Pcars a unnamed guy ripped it and the UV Wrap is still usable for skins, all AC skins are suitable for all Pcars skins^^
The Model for the mod was from the first apereance of the M1 in Pcars a unnamed guy ripped it and the UV Wrap is still usable for skins, all AC skins are suitable for all Pcars skins^^