Recommended mod:

https://www.gta5-mods.com/tools/emfsp-easy-mod-folder-for-sp-player-mods


INSTRUCTIONS:

1. OpenIV in Edit mode 

2. Go to:

a) Original GTA 5 install dir / x64v.rpf / models / cdimages / streamedpeds_players.rpf / player_two (best in mod GTA 5 subfolder)

b) See recommended mod
   

3.  Add/Replace uppr_diff_000_c_uni.ytd


Good luck ;)