Since about 2012 I have been finding original texture sources to the 3D GTA series.
By first link archive with sources in jpg format and some created in .psd (photoshop) and bmp. As well as other rubbish (photos, original textures, etc.). These are not all sources and I can’t upload them all, because. they weigh over 8GB. But the textures created from these sources can be downloaded from the following link:
By second link (mirror) created textures from these sources in the game format dds, that is, ready for insertion into the game. Also built from scratch. This archive is updated periodically.
Permission is granted to use in your mods, but with attribution. They have already been used in several mods (VRTP, RoSA ..).