To install copy the following files to their location - 

head_diff_027_a_chi - Grand Theft Auto V\mods\update\x64\dlcpacks\mppatchesng\dlc.rpf\x64\models\cdimages\mppatches.rpf\mp_m_freemode_01
mp_fm_skin_m_up_chi - Grand Theft Auto V\mods\update\x64\dlcpacks\patchday4ng\dlc.rpf\x64\models\ped_mp_overlay_txds.rpf