I created these viper helmets for personal use, but I think they are too cool not to share.
They should be compatible with any viper livery that uses the current pilot model.
Installation instructions:
1- Pick a helmet and put the dds file inside your chosen livery folder
2- Add the following line to the livery table within description.lua (make sure it's the only entry for "pilot_F16_helmet"):
{"pilot_F16_helmet", 0 , "pilot_F16_helmet", false};
3- Enjoy your fancy new helmet! (If you manage to see it ^^)