Part Notes: Impala, Monte Carlo; 1ST Design (English; Thread); 3.4L;Impala, Monte Carlo; 1ST Design (English; Thread); 3.8L; Standard Cooling;Impala, Monte Carlo; 2ND Design (Metric Thread); 3.4L;Impala, Monte Carlo; 2ND Design (Metric Thread); 3.8L; Standard Cooling