Files in the folder "sanpedro.rpf" go to:  

GTAV\mods\x64m.rpf\levels\gta5\_cityw\sanpedro_01\sanpedro.rpf


Files in the folder "sp1_11.rpf" go to:
 
GTAV\mods\x64m.rpf\levels\gta5\_cityw\sanpedro_01\sp1_11.rpf