The textures for the cars have been made by "Per_zeus" (https://de.gta5-mods.com/users/Per_zeus)
Improvements to the windshield texture have been made by "kizacudo"

Feel free to check out the official gta5-mods page of Per_zeus' texture:
https://de.gta5-mods.com/vehicles/raindrop-texture-beta