These Urethane Spoilers give your Corvette a factory-fresh appearance and restore proper air flow through your radiator, solving many cooling problems. These C4 Corvette reproduction spoilers are made, look and install the same as the factory Z-51 spoilers.The Z-51 performance spoiler may be used on any 1984-1990 Corvette as an upgrade to increase more air flow through the radiator for improved engine cooling. This listing is for one 3 piece kit for the 84-90 Corvette, please reuse your stock hardware during installation.