[matyi10012]

You should try this.
I've changed GetVehicleModel to GetPlayerVehicleID.

Код:

{
    new vehicleid = GetVehicleModel(vehicleid);
    if(!IsPlayerCop(playerid)) return SendClientMessage(playerid, 0xFF0000AA, "You are not authorized to use this command"); // only cops can use it.
    if(GetPlayerState(playerid) != PLAYER_STATE_DRIVER) return SendClientMessage(playerid, 0xFF0000AA, "You must be a driver to use this command"); // only cops can use it.
    if(GetVehicleModel(vehicleid) != vehicle[0] || vehicle[1] || vehicle[2] || vehicle[3]) return SendClientMessage(playerid, 0xFF0000AA, "You can't do that in this vehicle");
    if(GetPlayerVehicleID(playerid) == vehicle[0])
    {
        AttachObjectToVehicle(object[0], vehicle[0], -0.034999, 0.434999, 0.299999, 0.000000, 0.000000, 0.000000); //Object Model: 18646 | ZR350 1
    }
    if(GetPlayerVehicleID(playerid) == vehicle[1])
    {
         AttachObjectToVehicle(object[1], vehicle[1], -0.034999, 0.434999, 0.299999, 0.000000, 0.000000, 0.000000); //Object Model: 18646 | ZR350 2
    }
    if(GetPlayerVehicleID(playerid) == vehicle[2])
    {
        AttachObjectToVehicle(object[1], vehicle[1], -0.034999, 0.434999, 0.299999, 0.000000, 0.000000, 0.000000); //Object Model: 18646 | Sultan 1
    }
    if(GetPlayerVehicleID(playerid) == vehicle[3])
    {
        AttachObjectToVehicle(object[1], vehicle[1], -0.034999, 0.434999, 0.299999, 0.000000, 0.000000, 0.000000); //Object Model: 18646 | Sultan 2
    }
    return 1;
}