You first have to find out if it is a "sl1" or a "sl2", the waway you can tell is the SL1 has the spark plugs on the side of the head and the SL2 has the plugs in the top of the head through the valve cover gasket. once you know which one you have ask your locale General Motors dealer for the part # for factory (AC Delco) plugs. Once you know that you will be able to find the right spark plugs at a part store of your choosing. it will be the right plug but different stores charge different prices for the same part.
NGK spark plugs, Saturn part number for the SOHC is 21025102 and for the DOHC is 21025103.
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