This replacement engine coolant thermostat housing is engineered to match the fit and durability of the stock thermostat housing on specified vehicles. It is designed to withstand extreme temperature changes to extend service life. Vehicle model years this part fits (be sure to check your vehicle trim using the Amazon garage) - [Buick Century: 1984, 1985] - [Buick Electra: 1982, 1983, 1984] - [Buick LeSabre: 1982, 1983, 1984, 1985] - [Buick Regal: 1982, 1983, 1984, 1985, 1986, 1987] - [Buick Riviera: 1982, 1983, 1984] - [Chevrolet Caprice: 1985] - [Chevrolet El Camino: 1983, 1984] - [Chevrolet Monte Carlo: 1984, 1985, 1986, 1987] - [GMC Caballero: 1983, 1984] - [Oldsmobile 98: 1981, 1982, 1983, 1985] - [Oldsmobile Cutlass Calais: 1983, 1984] - [Oldsmobile Cutlass Ciera: 1984, 1985] - [Oldsmobile Cutlass Salon: 1985, 1986, 1987] - [Oldsmobile Cutlass Supreme: 1983, 1984, 1985, 1986, 1987] - [Oldsmobile Delta 88: 1980, 1981, 1983, 1984, 1985] - [Oldsmobile Toronado: 1981, 1982, 1983, 1984] - [Pontiac Bonneville: 1983, 1984, 1985, 1986] - [Pontiac Grand Prix: 1983, 1984, 1985, 1986, 1987] - [Pontiac Parisienne: 1984]