Hello all.
I added some cars that have different liveries on spawn, but i want to spawn only one livery.
EX: I have a car that is medic, he has different colour: yellow, red, white with “paramedic” stripe and others.
How can i spawn every time one of them?
Hello, you have two natives to do that :
SetVehicleMod(vehicle, 48, livery)
SetVehicleLivery(vehicle, livery)
https://runtime.fivem.net/doc/natives/#_0x6AF0636DDEDCB6DD
https://runtime.fivem.net/doc/natives/#_0x60BF608F1B8CD1B6
Second native only works with certain vehicles.
For example, a sanchez skin is set with SetVehicleMod.
The polmav skin is set with SetVehicleLivery.
If you had done a little research in existing resources, you could easily find the solution.
Forgot to specify i’m on a server, so i stream that add-on.
How can i set only one livery spawn?
Another thing is that some cars spawn with Policelight someone not, how can I set that all spawn with policelight?
Remove others livery in the ytd file(s) ?
Only client can specify “the livery”. Generally, the liveries names ended by xxxxx_sign_1.
“_1” is the “0” livery. If you remove other, every times, the vehicle spawn with the only available livery.
That was what i thought, how about the Police Light? How can i make that spawn everytime?
Some models do not allow it. In this case it is necessary to edit the model directly. Is not a “livery” but something like a variant.
In the model is set on “extra_1”, is there a way to force the permanent extra_1?
I d’ont know… The only time I tried to change the model, I broke everything … 
I’m not a model specialist 
I think i have to change the car then, so sad, thanks for the help!
Glad to help you
I’m thinking that somewhere there must be someone that says “spawn car with extra 1 or extra2” (one is normal siren, one is occultated siren). The questione is, where?
Found it.
On vehicles.meta you just have to add * FLAG_EXTRAS_ALL
Ok, interesting.
This flag add systematically the “extra” when the car spawn ?
Yes.
It adds all extras available for the car every time.
If you want to spawn only some, you have to USE FLAG_EXTRAS_REQUIRE and specify which extras are required
Ok ! Thanks ! Finally, you helped me ! 
Theses infos was here : https://forums.gta5-mods.com/topic/19786/tutorial-how-to-make-specific-vehicle-extras-appear-on-a-vehicle-every-spawn
Yes, after 3h of research i found that topic.
Hi bro, can you help me pls? I’m trying to make one job and when you spawn the car the car spawn all skins (the car is one burrito). I tried to use the first code (SetVehicleMod(vehicle, 48, livery)) but the car still spwaning all skins
you’re welcome