Wrestling Mask goes to:
Male: mods > update > x64 > dlcpacks > mpgunrunning > dlc.rpf > x64 > models > cdimages > mpgunrunning_male.rpf > mp_m_freemode_01_mp_m_gurunning_01
Female(not tested): mods > update > x64 > dlcpacks > mpgunrunning > dlc.rpf > x64 > models > cdimages > mpgunrunning_female.rpf > mp_f_freemode_01_mp_f_gurunning_01

Michael Gas Mask, Bugstar Respirator, Day of the Dead Mask go to:
Male: mods > update > x64 > dlcpacks > mpheist3 > dlc.rpf > x64 > models > cdimages > mpheist3_male.rpf > mp_m_freemode_01_mp_m_heist3
Female (not tested): mods > update > x64 > dlcpacks > mpheist3 > dlc.rpf > x64 > models > cdimages > mpheist3_female.rpf > mp_f_freemode_01_mp_f_heist3

Everything else goes to:
Male: mods > update > x64 > dlcpacks > mphalloween > dlc.rpf > x64 > models > cdimages > mphalloween.rpf > mp_m_freemode_01_male_freemode_halloween
Female (not tested): mods > update > x64 > dlcpacks > mphalloween > dlc.rpf > x64 > models > cdimages > mphalloween.rpf > mp_f_freemode_01_female_freemode_halloween