Install path:

FEMALE:
Mods\update\x64\dlcpacks\mpstunt\dlc.rpf\x64\models\cdimages\mpstunt_female.rpf\mp_f_freemode_01_mp_f_stunt_01

MALE:
Mods\update\x64\dlcpacks\mpstunt\dlc.rpf\x64\models\cdimages\mpstunt_male.rpf\mp_m_freemode_01_mp_m_stunt_01