S𝗶𝗻𝗴𝗹𝗲𝗽𝗹𝗮𝘆𝗲𝗿:
Open OpenIV and turn 𝗘𝗱𝗶𝘁 𝗠𝗼𝗱𝗲 on.
Go to the folder mods\update\x64\dlcpacks\mpgunrunning\dlc.rpf\x64\models\cdimages\mpgunrunning_male.rpf\mp_m_freemode_01_mp_m_gunrunning_01
Drag and drop files from SP folder!
𝗙𝗶𝘃𝗲𝗠: Streaming new hairstyles for characters: Step by Step for dummies (Override method)
Credits:
DNA MODS
What the hair