In Open IV, Navigate to: Grand Theft Auto V\mods\x64e.rpf\models\cdimages\componentpeds_s_m_y.rpf\ and replace s_m_y_sheriff_01. 

(Female Extra): Navigate to: Grand Theft Auto V\mods\update\x64\dlcpacks\patchday6ng\dlc.rpf\x64\models\cdimages\patchday6ng.rpf\ and replace s_f_y_sheriff_01.