@TheMurderousCricket Thanks anyway, I'll try doing what you said, cheers.

@thebegin10 No, I didn't, I usually replace files directly. Seemed to work for Michael and Franklin hair mods though.

@TheMurderousCricket How would I merge files? You could drop me a link where I can learn how to do if you don't want to explain, thanks.

I'm running the latest GTA V version (1.0.1604.1)
The mods I've been having problems with are numerous Trevor hair replacement mods, these mods are:

• New Trevor Hair & Look Pack | 3 Hair Models...
• New Pack For T (Hair & Tops)
• New Hair & Hat For Trev 1.0
• trevor's hair 1.0

I'm not sure if these mods overwrite each other, but I'm more than certain that I've followed the installation process correctly for everyone of these mods throughout.

Thanks alot for reading, hope to hear from anyone who are willing to help.