Yeah, S1 were optional. Just remember, by law, you must NOT remove an airbag equiped wheel and replace it with a non-airbag wheel. Insurance companies, police, you name it, they will know if you have an accident and no airbag was present- NIL insurance cover. Just remember its very easy for any company that has a vested interest in your vehicle to find out if your car was airbag equiped from factory. VIN numbers give it away.