Requirements:
GTA SA 1.0 US Hoodlum EXE
Silent ASI loader

The user specifies which vehicle spawns in which city. So you can make model 596
spawn only in Ganton, for instance. This allows you to have multiple cop cars per city/town. For roleplay, with this mod, you can now have Ganton PD, Willowfield PD, Temple PD, etc etc.

The mod makes a jump from SA's GetDefaultPoliceCarModel().
The way the mod works is that it checks the city name and if a vehicle is defined, then load that model and return it, if no definition then return default town vehicle (596, 597, 598, 599).

Installation:
Install Silent's ASI Loader: http://www.gtagarage.com/mods/show.php?id=21709

Put everything in the root (or script folder or modloader) of SA installation.
Edit your preferences in ExclusiveCityPolice.dat file.