I have added this police cruiser to my server.
I changed carvariations so that it would use siren id 13 which enables the lights to rotate. I am not happy with how the lights reflect off surfaces, or lack thereof, and copied over siren id 13 from the default carcols.ymt and changed a few settings.
Oddly, even with carcols.meta in my resource folder, and it being called in _resource.lua, it still reverts back to the default siren settings.
When I change the custom carcols to a different id number, and match it with carvariations, the lights simply stop working on the car…meaning they do not turn on whatsoever.