Police mods (like LSPDFR) frequently require you to replace police.awc , police2.awc , or police3.awc . These files are usually located inside x64f.rpf under \data\audio\config\ and the actual .awc files in \x64\audio\sfx\ .
While the actual radio station music is stored in .rpf files inside the x64 folder, the metadata that controls radio advertisements, DJ banter timing, and song transitions is partially scripted within configuration files found here. x64f.rpf
On a standard Steam, Epic Games, or Rockstar Launcher installation of GTA V, you will find x64f.rpf at the following path: Police mods (like LSPDFR) frequently require you to