Hi, I've got a 2000 model and in it the middle seat is fitted with a lap belt. It is connected by plugging it in to both the seat belt fastening on the the seat. Unfortunately This means it can be easily removed if you want to swap the seats around but unfortunately it can also be just as easily lost and lost! It might be worth checking with the previous owner in case they still have it. Otherwise assuming its not tucked away in one of the storage compartments you will probably have to source a replacement.