I have made a few modifications to the Chevrolet Caprice and USAF Merit from this mod: Retro Emergency Vehicles Pack – GTA5-Mods.com
I have changed the Handling and made it fit the San Andreas State Police theme.
Here is the download link:
Mega: 15.68 MB file on MEGA
Direct: SASP Vintage Pack.rar (15.7 MB)
Credit goes to Lozano71 for creating the original mod: Retro Emergency Vehicles Pack – GTA5-Mods.com
Original source: https://forum.cfx.re/t/sasp-retro-police-car-pack/2260587