These Hood Louvers were molded from an OEM louver for proper fit. They can also be utilized as a universal louver for other cars. We cut larger openings into the louver to allow more heat and underhood pressure to escape, compared to the OEM louver. At 2.5 oz. each, they also weigh less than the OEM parts. Hood Louvers can be attached with double-sided 3M tape which or you may attach with rivits. Made from 100% carbon fiber. Dimension are 4.5" at the rear including the flange, 4" at the front, and 20.5" long and are about 1" deep. The flange around the entire perimeter is 1/2" wide.