1.Install OPENIV 2.6.4
2.GTAV/x64v.rpf/models/cdimages/componentpeds_a_m_y.rpf
3.Delete:       a_m_y_musclbeac_01.ydd, a_m_y_musclbeac_01.yft, a_m_y_musclbeac_01.ymt, a_m_y_musclbeac_01.ytd

4.Add New File: a_m_y_musclbeac_01.ydd, a_m_y_musclbeac_01.yft, a_m_y_musclbeac_01.ymt, a_m_y_musclbeac_01.ytd