#include <a_samp>

new
    LockVehiclePlayerSkinId[] = { 114, 115, 156, 231 };

public OnVehicleStreamIn(vehicleid, forplayerid)
{
    new
        ModelID = GetVehicleModel(vehicleid);
    if(ModelID == 560) // Sultan ModelID 560
    {
        new
            PlayerSkin = GetPlayerSkin(forplayerid);
        for(new i; i < sizeof LockVehiclePlayerSkinId; i++)
        {
            if(PlayerSkin == LockVehiclePlayerSkinId[i]) { SetVehicleParamsForPlayer(vehicleid, forplayerid, false, true); }
        }
    }
    return 1;
}

//OR:
/*
public OnVehicleStreamIn(vehicleid, forplayerid)
{
    new
        ModelID = GetVehicleModel(vehicleid);
    if(ModelID == 560)// || ModelID == 561 || ModelID == 578) // Sultan ModelID 560
    {
        new
            PlayerSkin = GetPlayerSkin(forplayerid);
        if(PlayerSkin == 114 || PlayerSkin == 115 || PlayerSkin == 156 || PlayerSkin == 231)
        {
            SetVehicleParamsForPlayer(vehicleid, forplayerid, false, true);
        }
    }
    return 1;
}*/