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This engine cylinder head 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. Vehicle model years this part fits (be sure to check your vehicle trim using the Amazon garage) - [Cadillac Calais: 1976] - [Cadillac Commercial Chassis: 1976, 1977, 1978, 1979, 1980, 1981] - [Cadillac DeVille: 1976, 1977, 1978, 1979, 1980, 1981] - [Cadillac Eldorado: 1976, 1977, 1978, 1979, 1980, 1981] - [Cadillac Fleetwood: 1976, 1977, 1978, 1979, 1980, 1981] - [Cadillac Seville: 1976, 1977, 1978, 1979, 1980, 1981]