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) - [Chevrolet G10: 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991] - [Chevrolet G20: 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991] - [Chevrolet G30: 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991] - [Chevrolet P20: 1983, 1984, 1985, 1986, 1987, 1988, 1989] - [Chevrolet P30: 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991] - [GMC G1500: 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991] - [GMC G2500: 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991] - [GMC G3500: 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991] - [GMC P2500: 1983, 1984, 1985, 1986, 1987, 1988, 1989] - [GMC P3500: 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991]