This air cleaner top mimics the factory air cleaner top on 1988 to 1992 Small Block powered, Full-sized Chevy and GMC trucks, as well as, 1983 to 1988 Oldsmobile 442 and Cutlass, and Chevy Monte Carlo SS models. The single wing nut design cover includes a fresh, factory-style foam rubber sealing ring. The durable black finish is an excellent alternative to a shiny chrome cover.