RacingFreak | Driver: San Francisco - Black & White Police Dodge Monaco (Revised + Download) @RacingFreak | Uploaded November 2020 | Updated October 2024, 19 hours ago.
Very quickly after my initial experiments, @Olanov has managed to find an even better way of doing it without destroying the material colours of other cars!

Download link: nexusmods.com/driversanfrancisco/mods/7

Or if you feel more comfortable using xdelta to patch dngvehicles.sp instead, here's the link: solidfiles.com/v/vzdB4mZK64Zzp

Driver Madness Discord Server: discord.gg/sxt45rR

Enjoy!