This gasket is for 1991-1995 Saturn S Series DOHC engine thermostat housing. Its diameter is about 10% larger than the FACTORY thermostat. This is ironic as many AC Delco products are sold under the Professional label. They are advertised as OEM equivalents. Many of them are not. Not OEM. I don't need to drain the water from the cooling system to find out. Please include this information in the product description so people know what this product is and isn't good for.
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