This engine expansion plug is designed to match the fit and function of the original part on specified vehicles. Made of quality materials, it is engineered for reliable performance. This part is compatible with the following vehicles. Before purchasing, enter your vehicle trim in the garage tool to confirm fitment. [Chevrolet Monza: 1975] - [Chevrolet Vega: 1971, 1972, 1973, 1974, 1975, 1976, 1977] - [GMC PM151: 1956, 1957, 1958, 1959] - [GMC PM152: 1957, 1958, 1959] - [GMC PM153: 1957, 1959] - [GMC PM251: 1956, 1958, 1959] - [GMC PM252: 1958] - [GMC PM253: 1958] - [GMC Truck: 1955, 1957] - [Oldsmobile Starfire: 1976, 1977] - [Pontiac Astre: 1975, 1976, 1977] - [Pontiac Bonneville: 1957] - [Pontiac Catalina: 1955, 1956, 1957] - [Pontiac Chieftain: 1955, 1956, 1957] - [Pontiac Star Chief: 1955, 1956, 1957] - [Pontiac Sunbird: 1976, 1977] - [Pontiac Super Chief: 1957]